Bump peaceiris/actions-label-commenter from v1.6.1 to v1.8.1 (#360)

Bumps [peaceiris/actions-label-commenter](https://github.com/peaceiris/actions-label-commenter) from v1.6.1 to v1.8.1.
- [Release notes](https://github.com/peaceiris/actions-label-commenter/releases)
- [Changelog](https://github.com/peaceiris/actions-label-commenter/blob/main/CHANGELOG.md)
- [Commits](peaceiris/actions-label-commenter@v1.6.1...293ccb9)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/dependabot-merge.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Dependabot Commenter
         if: |
           (github.event.label.name == ':shipit: merge') && (github.event.pull_request.user.login == 'dependabot[bot]' || github.event.pull_request.user.login == 'dependabot-preview[bot]')
-        uses: peaceiris/actions-label-commenter@v1.6.1
+        uses: peaceiris/actions-label-commenter@v1.8.1
         with:
           github_token: ${{ secrets.RSG_BOT_TOKEN }}
           config_file: .github/label-commenter-dependabot.yml