chore: update mcp schema version

[niyiomotoso]

This pull request makes a minor update to the build/mcp-server/server.json file, updating the $schema reference to point to a newer schema version.

• Updated the $schema URL to use the 2025-12-11 schema, ensuring compatibility with the latest schema definitions.

[greptile-apps]

Greptile Overview

Greptile Summary

Updated the Model Context Protocol (MCP) server schema reference from version 2025-10-17 to 2025-12-11 in the MCP registry configuration file.

• Single-line change updates the $schema URL to point to the newer schema definition
• Ensures the Testkube MCP server configuration validates against the latest schema specifications
• No changes to server metadata, package configuration, or environment variables
• Change is part of ongoing MCP registry preparation work (following PR feat: prepare MCP Server for the MCP registry #6780)

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• Simple schema version update with no functional changes to server configuration, metadata, or environment variables. The change only updates a reference URL for validation purposes.
• No files require special attention

Important Files Changed

Filename	Overview
build/mcp-server/server.json	Updated $schema URL from 2025-10-17 to 2025-12-11 version

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant File as server.json
    participant Registry as MCP Registry
    participant Client as AI Assistant/Client

    Dev->>File: Update $schema to 2025-12-11
    Note over File: Schema validation URL updated<br/>from 2025-10-17 to 2025-12-11
    
    Dev->>Registry: Submit server.json for registration
    Registry->>File: Validate against schema
    Note over Registry,File: Uses https://static.modelcontextprotocol.io/<br/>schemas/2025-12-11/server.schema.json
    
    Registry-->>Dev: Validation successful
    
    Client->>Registry: Discover Testkube MCP server
    Registry-->>Client: Return server metadata
    Note over Client: Receives validated server.json<br/>with package info and env vars
    
    Client->>Client: Configure MCP connection
    Note over Client: Uses OCI package:<br/>docker.io/kubeshop/mcp-server:latest

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