Bump slackapi/slack-github-action from 1.18.0 to 1.19.0 (#49127)

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 1.18.0 to 1.19.0.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](https://github.com/slackapi/slack-github-action/compare/v1.18.0...v1.19.0)

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

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

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

.github/workflows/detect-breaking-changes-report.yml

@@ -104,7 +104,7 @@ jobs:
     - name: Post to Slack
       id: slack
       if: ${{ steps.levitate-run.outputs.exit_code == 1 && steps.does-label-exist.outputs.result == 0 }}
-      uses: slackapi/slack-github-action@v1.18.0
+      uses: slackapi/slack-github-action@v1.19.0
       with:
         payload: |
           {