chore: update GitHub Actions to Node 24

[jonathannorris]

Summary

• Update GitHub Actions and custom action dependencies to Node 24-compatible releases.
• Update nested dependencies in composite and custom actions.
• Retain actions without an available Node 24 release.

[Copilot]

Pull request overview

This PR updates GitHub Actions workflow dependencies to newer major releases intended to be compatible with Node 24.

Changes:

• Bump actions/checkout to v7 and actions/setup-java to v5 across CI/release workflows.
• Update Gradle setup action usage to gradle/actions/setup-gradle@v6.
• Update semantic PR title check to amannn/action-semantic-pull-request@v6.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
.github/workflows/unit-test.yml	Updates checkout/setup-java and Gradle setup action versions for unit test CI.
.github/workflows/test-examples.yml	Updates checkout/setup-java and Gradle setup action versions for example validation CI.
.github/workflows/release.yml	Updates checkout/setup-java versions used during the release workflow.
.github/workflows/checks.yml	Updates semantic PR title action to a newer major release.

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