Disable approval for GH actions workflows

[danthe1st]

When some files in a plugin are changed for the first time, the version numbers need to be bumped in the META-INF/MANIFEST.MF (and potentially pom.xml) files.

To make this less annoying, GitHub Actions automatically updates the PR with the version bump and adds a comment.

Something similar is done to tell users when their PR has merge commits.
However, these actions won't be executed for PRs written by first-time contributors to a repository until a committer approves them (and I'd argue that especially the check for merge commits is pretty relevant for first-time contributors).

Because of that, I suggest changing the approval setting for GitHub actions to "Require approval for first-time contributors who are new to GitHub" in most repositories using that action (Settings > Actions > General > Approval for running fork pull request workflows from contributors) - at least in projects where the committers/project leads want that.

I don't think allowing anyone to use GitHub Actions would be much of an issue because anyone who fixed a typo or similar can already do that.