Update all actions we use in our workflows to pull from specific pinned commits

[dkotter]

All Submissions:

• Does your code follow the WooCommerce Sniffs variant of WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Will this change require new documentation or changes to existing documentation?

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Changes proposed in this Pull Request:

In order to help protect against compromised actions, instead of including actions based on their major version (like v4), this PR switches all the actions we use to pull based on the commit hash from the latest release.

While this does impact maintenance a bit going forward, it ensures that we we're always using actions that we (hopefully) trust and if an action gets compromised (which happens) we don't have to worry that we're using a compromised action. This also goes along with what GitHub suggests.

Steps to test the changes in this Pull Request:

Ensure all our workflows still run as expected

Changelog entry

Dev - Update all third-party actions our workflows rely on to use versions based on specific commit hashes

[iamdharmesh]

🚀