chore(deps): bump slackapi/slack-github-action from 1.25.0 to 2.1.1

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 1.25.0 to 2.1.1.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@6c661ce...91efab1)

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

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

Author: dependabot[bot]

.github/workflows/ci-notify-slack.yml

@@ -24,7 +24,7 @@ jobs:
           echo "safe_title=$ESCAPED_TITLE" >> "$GITHUB_OUTPUT"
 
       - name: Post to a Slack channel
-        uses: slackapi/slack-github-action@6c661ce58804a1a20f6dc5fbee7f0381b469e001 # v1.25.0
+        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.1
         with:
           channel-id: eng-execution-mrs
           slack-message: ":github: `${{ github.repository }}` <${{ github.event.pull_request.html_url }}|${{ steps.sanitize.outputs.safe_title }}>"