Bump kafka version to 4.6.3

[pasindufernando1]

Purpose

$subject

[Copilot]

Pull request overview

This PR updates the Kafka library version from 4.6.2 to 4.6.3. However, the update is incomplete as many test resource files still reference the old version.

Changes:

• Updated ballerinaxKafkaVersion to 4.6.3 in gradle.properties
• Updated icon URLs and package info in two test resource JSON files

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
gradle.properties	Updated Kafka version property from 4.6.2 to 4.6.3
flow-model-generator/modules/flow-model-generator-ls-extension/src/test/resources/diagram_generator/config/query_action.json	Updated icon URLs and packageInfo references for Kafka from 4.6.2 to 4.6.3
architecture-model-generator/modules/architecture-model-generator-ls-extension/src/test/resources/artifacts/config/kafka.json	Updated icon URLs for Kafka components from 4.6.2 to 4.6.3

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