Bump slackapi/slack-github-action from 1.21.0 to 1.22.0 (#879)

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 1.21.0 to 1.22.0.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@v1.21.0...v1.22.0)

---
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>

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

.github/workflows/trivy-scan.yml

@@ -38,15 +38,15 @@ jobs:
           echo "SUMMARY=$summary" >> "$GITHUB_ENV"
       - name: Send Slack Notification
         if: success()
-        uses: slackapi/slack-github-action@v1.21.0
+        uses: slackapi/slack-github-action@v1.22.0
         env:
           SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
         with:
           channel-id: C010XR15VHU
           slack-message: "${{ env.SUMMARY }}"
       - name: Send Failure notification
         if: failure()
-        uses: slackapi/slack-github-action@v1.21.0
+        uses: slackapi/slack-github-action@v1.22.0
         env:
           SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
         with:
@@ -117,15 +117,15 @@ jobs:
           fi
       - name: Send Slack Notification if Scan Ran Successfully
         if: steps.cve-summary.outputs.summary != ''
-        uses: slackapi/slack-github-action@v1.21.0
+        uses: slackapi/slack-github-action@v1.22.0
         with:
           slack-message: "New CVEs found! Check https://github.com/vmware-tanzu/carvel-kapp-controller/security/code-scanning for details \n ${{ steps.cve-summary.outputs.summary }}"
           channel-id: C010XR15VHU
         env:
           SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
       - name: Send Failure notification
         if: failure()
-        uses: slackapi/slack-github-action@v1.21.0
+        uses: slackapi/slack-github-action@v1.22.0
         env:
           SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
         with: