Bump slackapi/slack-github-action from 1.23.0 to 2.0.0 (#177)

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 1.23.0 to 2.0.0.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](https://github.com/slackapi/slack-github-action/compare/v1.23.0...v2.0.0)

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

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

.github/workflows/main.yml

@@ -94,7 +94,7 @@ jobs:
     steps:
       - name: Notify in Slack channel
         if: ${{ needs.build_multiarch.result == 'failure' || needs.deploy_manifests.result == 'failure' }}
-        uses: slackapi/slack-github-action@v1.23.0
+        uses: slackapi/slack-github-action@v2.0.0
         with:
           payload: |
             {