Bump slackapi/slack-github-action in /.github/workflows

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@v2.1.0...v2.1.1)

---
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/ci-testing.yml

@@ -144,7 +144,7 @@ jobs:
     steps:
       - name: Check for failure and notify
         if: (needs.Benchmarks.result == 'failure' || needs.Tests.result == 'failure' || needs.Benchmarks.result == 'cancelled' || needs.Tests.result == 'cancelled') && github.repository == 'ultralytics/yolov5' && (github.event_name == 'schedule' || github.event_name == 'push') && github.run_attempt == '1'
-        uses: slackapi/[email protected].0
+        uses: slackapi/[email protected].1
         with:
           webhook-type: incoming-webhook
           webhook: ${{ secrets.SLACK_WEBHOOK_URL_YOLO }}