ci: upgrade workflow actions to Node 24-compatible versions

[Pygmalion69]

Motivation

• Address GitHub Actions deprecation warning for Node.js 20 by switching to action majors that support Node.js 24.

Description

• Bumped action majors in CI workflow files: actions/checkout@v4 → actions/checkout@v6, actions/setup-java@v4 → actions/setup-java@v5, and gradle/actions/setup-gradle@v4 → gradle/actions/setup-gradle@v5.
• Applied these updates in both .github/workflows/android.yml and .github/workflows/android-foss-release.yml with no other logic changes.

Testing

• Ran rg to search workflows for the old action references and confirmed updates completed successfully.
• Generated and reviewed the diff via git diff to verify only the action version lines changed.
• Committed the changes with git commit, and inspected workflow files with sed/nl to confirm the new versions; all checks passed.

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Codex Task