Bump protobuf from 6.32.0 to 6.33.5 in /protovalidate/grpc-python/start

[dependabot]

@EaganVP - Our team maintains the buf-examples repository, which holds any example code that doesn't merit its own repository. We use a pretty normal dependabot task to maintain its dependencies, and this PR (created by dependabot) provided a lesson about the BSR that I wanted to pass along.

You'll learn more about this over the coming weeks, but in a nutshell:

1. Without the BSR or the Buf CLI, anyone who wants to generate code from Protobuf files needs to use protoc and local binaries (protoc "plugins") to generate code, like Python types for messages in the Proto.
2. With the BSR or the CLI, you can use remote code generation to let the BSR handle code generation for you: no need to install/maintain local binaries.
3. With the BSR, you don't even have to know how to use remote code generation via a buf.gen.yaml. If you want the standard options, you can just download pregenerated code: a "generated SDK," installable via pip, npm, Gradle, etc.

In the Python examples in this repository, we use such generated SDKs to depend on Python code for Protovalidate via requirements.txt files:

bufbuild-protovalidate-protocolbuffers-pyi==32.0.0.1.20250912141014+52f32327d4b0

The version used here needs to match the underlying version of the Protobuf Python library itself. In response to a vulnerability in that library, dependabot's commit for this PR updates the Protobuf library to 6.33.5:

protobuf==6.33.5

This caused a mismatch: protobuf 6.33.5 isn't compatible with Protovalidate's generated SDK for Python version 32.0.

Therefore, my commit to this PR:

1. Updates protobuf to 6.33.5 for all four Python examples in this repo
2. Updates the Python generated SDKs to compatible versions.

Testing/verification:

1. The CI task on this PR should pass.
2. You can verify it yourself by cloning this repo, changing to this branch, and running make ci.

---

Bumps protobuf from 6.32.0 to 6.33.5.

Release notes

Sourced from protobuf's releases.

Protocol Buffers v34.0-rc1

Announcements

• This version includes breaking changes to: C++, Objective-C, PHP, Python.
• [Bazel] Remove deprecated ProtoInfo.transitive_imports. Use equivalent transitive_sources instead (protocolbuffers/protobuf@0a5c2f6)
• [C++] Make generator headers private (protocolbuffers/protobuf@3a2af35)
• [C++] Add a debug check that the target of CopyFrom is not a descendant of the source. (protocolbuffers/protobuf@7a75898)
• [C++] Add [[nodiscard]] to many APIs. (protocolbuffers/protobuf@a70115f)
• [C++] Make the arena-enabled constructors of RepeatedField, RepeatedPtrField, and Map private. (protocolbuffers/protobuf@ef890c3)
• [C++] Remove deprecated FieldDescriptor::label() in OSS. Use is_repeated() or is_required() instead (protocolbuffers/protobuf@b76faa9)
• [C++] Removes proto2::util::MessageDifferencer::AddIgnoreCriteria that takes a raw pointer as an argument in favor of the overload that takes a unique_ptr. Remove macro PROTOBUF_FUTURE_REMOVE_ADD_IGNORE_CRITERIA (protocolbuffers/protobuf@b115358)
• [C++] Remove deprecated FieldDescriptor::has_optional_keyword() in OSS. Use is_repeated() or has_presence() instead (protocolbuffers/protobuf@68346ec)
• [C++] Remove AddUnusedImportTrackFile() and ClearUnusedImportTrackFiles(). Remove PROTOBUF_FUTURE_RENAME_ADD_UNUSED_IMPORT (protocolbuffers/protobuf@837a2cd)
• [C++] Remove deprecated FieldDescriptor::is_optional() in OSS. Use (!is_required() && !is_repeated()) instead (protocolbuffers/protobuf@9dbc5d4)
• [C++] Remove deprecated UseDeprecatedLegacyJsonFieldConflicts() (protocolbuffers/protobuf@c301c2c)
• [C++] All entity names have length limit (2afb0dc)
• [ObjC] Remove generate_minimal_imports generation option warning (protocolbuffers/protobuf@45b1297)
• [ObjC] Fix nullability annotations on some GPB*Dictionary types. (protocolbuffers/protobuf@ea67d6d)
• [ObjC] Remove -[GPBFieldDescriptor optional] (protocolbuffers/protobuf@3414dc1)
• [Other] Remove deprecated flag for enabling MSVC support (protocolbuffers/protobuf@97c979b)
• [PHP] Remove deprecated PHP APIs (protocolbuffers/protobuf@9c45014)
• [PHP] Remove deprecated PHP APIs FieldDescriptor getLabel, use IsRepeated or isRequired instead. (protocolbuffers/protobuf@4208121, protocolbuffers/protobuf@cd76e67, protocolbuffers/protobuf@4208121)
• [PHP] Add PHP typehints for setters and remove redundant GPBUtil checks (protocolbuffers/protobuf#25296) (protocolbuffers/protobuf@aee03b7)
• [PHP] support default values for editions/proto2 (protocolbuffers/protobuf#25161) (protocolbuffers/protobuf@b01099d)
• [Python] Raise errors in OSS when assign bool to int/enum field in Python Proto. (protocolbuffers/protobuf@5b116fe)
• [Python] Remove float_format/double_format from python proto text_format (protocolbuffers/protobuf@e4854a1)
• [Python] Raise TypeError when convert non-timedelta to Duration, or convert non-datetime to Timestamp in python proto. (Original code may raise ArributeError) (protocolbuffers/protobuf@00aaca1)
• [Python] Remove float_precision from python proto json_format (protocolbuffers/protobuf@f027f1f)
• [Python] Remove deprecated FieldDescriptor::label() in OSS. Use is_repeated() or is_required() instead (protocolbuffers/protobuf@b76faa9)
• [Python] Remove deprecated FieldDescriptor.label (protocolbuffers/protobuf@0a8ff55)
• [Python] Remove deprecated UseDeprecatedLegacyJsonFieldConflicts() (protocolbuffers/protobuf@c301c2c)
• Protobuf News may include additional announcements or pre-announcements for upcoming changes.
• Migration Guide may include additional guidance for breaking changes.

Bazel

• Fix: cc_toolchain should prefer protoc when prebuilt flag is flipped. (#25168) (protocolbuffers/protobuf@8c857c3)
• Breaking change: Remove deprecated ProtoInfo.transitive_imports. Use equivalent transitive_sources instead (protocolbuffers/protobuf@0a5c2f6)
• Feat(bazel): wire up prebuilt protoc toolchain (#24115) (protocolbuffers/protobuf@cc23698)
• Migrate proto_descriptor_set (#23369) (protocolbuffers/protobuf@8d4dfdd)

Compiler

• Ruby codegen: support generation of rbs files (#15633) (protocolbuffers/protobuf@6ebdf85)
• Avoid collision name problems between a message named Xyz and a direct sibling enum named XyzView (protocolbuffers/protobuf@eba53e8)
• Generalizing and implementing ValidateFeatureSupport for both Options and Features during proto parsing (protocolbuffers/protobuf@ed3c571)
• Fix a bug with custom features outside of the pb package. (protocolbuffers/protobuf@872d3ce)
• Fix import option handling when include_imports isn't set. (protocolbuffers/protobuf@9ef9e80)
• Fix a bug in STRICT check of namespaced enums to properly check for 'reserved 1 to max' (protocolbuffers/protobuf@1229d4a)
• Prevent accidental stripping of debug_redact options via import option. (protocolbuffers/protobuf@f58b098)

C++

• Add EnumerateEnumValues function. (protocolbuffers/protobuf@397d5d9)

... (truncated)

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[EaganVP]

Approved: Verified build locally.