This PR starts running the init, autobuild, analyze, and upload-sarif Actions on Node 16. This is a breaking change for customers using GitHub Connect or the Actions sync tool to pull in the latest version of the v1 Action on older GHES versions (GHES 3.1–3.3), therefore we are bumping to a new major version with this change.

We'll need to revert these changes in the v1 branch within the v2 -> v1 merge during the next release process.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.