Pin GitHub Actions to immutable commit SHAs

[roryabraham]

Coming from https://expensify.slack.com/archives/CC7NECV4L/p1743022578963949, this pull request updates all mutable action references to use immutable commit hashes instead. This is a security measure to protect from supply chain attacks.

[github-actions]

Fails

🚫

📋 Missing Changelog - Can you add a Changelog? To do so, add a "## Changelog" section to your PR description. A changelog entry has the following format: [CATEGORY] [TYPE] - Message. Details CATEGORY may be: General iOS Android JavaScript Internal (for changes that do not need to be called out in the release notes) TYPE may be: Added, for new features. Changed, for changes in existing functionality. Deprecated, for soon-to-be removed features. Removed, for now removed features. Fixed, for any bug fixes. Security, in case of vulnerabilities. MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.

	Warnings
⚠️	📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.
⚠️	📋 Missing Summary - Can you add a Summary? To do so, add a "## Summary" section to your PR description. This is a good place to explain the motivation for making this change.

Generated by 🚫 dangerJS against 239c942

[roryabraham]

This repo is no longer in use