Add workaround for action mishandling of draft: true -> false transition

[huonw]

This works around softprops/action-gh-release not being able to properly "publish" a release by changing draft: true to draft: false.

The intention is that the step with draft: false would find the existing draft release and update it, but, previously, the action would fail to find the existing draft release and instead create a duplicate one. The old behaviour is visible (to people who can see draft releases) with v0.12.3-beta.0 and -beta.1:

The particular new version of the action is:

• changes: softprops/action-gh-release@master...huonw:action-gh-release:huonw/pantsbuild-fix-see-scie-pants-439 (specifically commit huonw/action-gh-release@55ec297 from branch https://github.com/huonw/action-gh-release/commits/huonw/pantsbuild-fix-see-scie-pants-439 )
• this is just the latest code (v2.2.0) with fix: updating release draft status from true to false softprops/action-gh-release#316 merged in

[huonw]

Ah, gonna do this with a branch in this repo, to be able test from the branch. #444