[Improvement] Auto-bump Homebrew formula on release

[asbjornu]

As discussed in #2374, we should automatically bump the version of the GitVersion formula in Homebrew on every release.

Context

Bumping the Homebrew formula is currently manual labour, but it can be automated so it should.

Possible Implementation

bump-homebrew-formula-action can do the bumping for us:

- uses: mislav/bump-homebrew-formula-action@v1
  with:
    # A PR will be sent to github.com/Homebrew/homebrew-core to update this formula:
    formula-name: gitversion
  env:
    COMMITTER_TOKEN: ${{ secrets.COMMITTER_TOKEN }}

[github-actions]

🎉 This issue has been resolved in version 5.6.1 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

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