Upgrade GitHub Actions to latest versions

[salmanmkc]

Summary

Upgrade GitHub Actions to their latest versions for improved features, bug fixes, and security updates.

Changes

Action	Old Version(s)	New Version	Release	Files
gradle/actions/setup-gradle	v3	v5	Release	release.yml, tests.yml, website.yml
peaceiris/actions-gh-pages	v3.8.0	v4.0.0	Release	website.yml
slackapi/slack-github-action	v1.26.0	v2.1.1	Release	slack-alert.yml
softprops/action-gh-release	v1	v2	Release	release.yml

Why upgrade?

Keeping GitHub Actions up to date ensures:

• Security: Latest security patches and fixes
• Features: Access to new functionality and improvements
• Compatibility: Better support for current GitHub features
• Performance: Optimizations and efficiency improvements

Security Note

Actions that were previously pinned to commit SHAs remain pinned to SHAs (updated to the latest release SHA) to maintain the security benefits of immutable references.

Testing

These changes only affect CI/CD workflow configurations and should not impact application functionality. The workflows should be tested by running them on a branch before merging.

[CLAassistant]

All committers have signed the CLA.

[coveralls]

Pull Request Test Coverage Report for Build #613

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.954%

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Totals
Change from base Build #610:	0.0%
Covered Lines:	559
Relevant Lines:	570

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💛 - Coveralls