Bump cbrgm/mastodon-github-action from 2.1.7 to 2.1.8

Bumps [cbrgm/mastodon-github-action](https://github.com/cbrgm/mastodon-github-action) from 2.1.7 to 2.1.8.
- [Release notes](https://github.com/cbrgm/mastodon-github-action/releases)
- [Commits](cbrgm/mastodon-github-action@b97a4c2...eec9734)

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

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@b97a4c288a6fd9d75821d92432704339202e090f # v2.1.7
+        uses: cbrgm/mastodon-github-action@eec9734402fe90511688538f942a916c61808ba7 # v2.1.8
         with:
           url: ${{ secrets.MASTODON_URL }}
           access-token: ${{ secrets.MASTODON_ACCESS_TOKEN }}