Bump cbrgm/mastodon-github-action from 2.0.6 to 2.1.0

Bumps [cbrgm/mastodon-github-action](https://github.com/cbrgm/mastodon-github-action) from 2.0.6 to 2.1.0.
- [Release notes](https://github.com/cbrgm/mastodon-github-action/releases)
- [Commits](cbrgm/mastodon-github-action@1c53215...3737c0d)

---
updated-dependencies:
- dependency-name: cbrgm/mastodon-github-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/publish-mastodon.yml

@@ -80,7 +80,7 @@ jobs:
 
  - name: Send toot to Mastodon
  if: ${{ github.event.inputs.dry-run != 'true' }} || ${{ github.event_name == 'release' }}
- uses: cbrgm/mastodon-github-action@1c5321597ce853344afff70aa5685887243f43fa # v2.0.6
+ uses: cbrgm/mastodon-github-action@3737c0d7ef1807f2446c19fa4fb4ebe2f275956c # v2.1.0
  with:
  url: ${{ secrets.MASTODON_URL }}
  access-token: ${{ secrets.MASTODON_ACCESS_TOKEN }}