Bump rtCamp/action-slack-notify from 2.1.0 to 2.2.0

Bumps [rtCamp/action-slack-notify](https://github.com/rtcamp/action-slack-notify) from 2.1.0 to 2.2.0.
- [Release notes](https://github.com/rtcamp/action-slack-notify/releases)
- [Commits](rtCamp/action-slack-notify@v2.1.0...v2.2.0)

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

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

.github/workflows/kind-e2e.yaml

@@ -58,7 +58,7 @@ jobs:
         artifact-name: logs-${{ matrix.k8s-version}}-${{ matrix.ingress }}
 
     - name: Post failure notice to Slack
-      uses: rtCamp/action-slack-notify@v2.1.0
+      uses: rtCamp/action-slack-notify@v2.2.0
       if: ${{ failure() && github.event_name != 'pull_request' }}
       env:
         SLACK_ICON: http://github.com/knative.png?size=48