chore(deps): bump slackapi/slack-github-action from 2.1.0 to 2.1.1

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@b0fa283...91efab1)

---
updated-dependencies:
- dependency-name: slackapi/slack-github-action
  dependency-version: 2.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -89,7 +89,7 @@ jobs:
     if: failure() && github.ref == 'refs/heads/main' && github.event_name != 'workflow_dispatch'
     steps:
       - name: Send notifications of failing tests
-        uses: slackapi/slack-github-action@b0fa283ad8fea605de13dc3f449259339835fc52 # v2.1.0
+        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.1
         with:
           errors: true
           webhook: ${{ secrets.SLACK_REGRESSION_FAILURES_WEBHOOK_URL }}