ci(test): update github actions

[Fdawgs]

This PR:

• Replaces EOL Node 21 in test matrix with Node 22, which is the next LTS
• Removes Git credentials after checkout as a security precaution by setting persist-credentials to false. They are not used after the initial checkout, and this stops them from accidentally leaking through a script; see related GitHub security post and related actions/checkout issue
• Bumps GitHub Actions to their latest major versions. Main change is they are now using Node 20 instead of 16, which was EOL as of April 2022:
  • Changelog for actions/checkout can be found here
  • Releases for actions/setup-node can be found here

[c0b41]

can you also drop node 18, and support node 23

[Fdawgs]

can you also drop node 18, and support node 23

Done!