https://github.com/zed-industries/zed/actions/runs/25881329418 complains
about the deprecation of Node.js version 20, which will soon be
force-bumped to 24 in the runner contexts.
Thus, this PR bumps all the jobs mentioned there to versions that run on
Node.js 24 by default. I checked all the release note section for the
three actions and this should not change any behaviour according to
their release notes and get us ready for the deprecation.
Release Notes:
- N/A
This helps with two things: Testing changes locally against real commits
as well as laying the groundwork for making things less convoluted for
the GitHub worker.
Also removes some useless wrapping left from an earlier direction.
Release Notes:
- N/A
This will ensure we do not post a second Slack message in case the first
check was successful. We still _run_ the second check, but do not notify
Release Notes:
- N/A
