Bump slackapi/slack-github-action from 1.27.0 to 2.0.0

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 1.27.0 to 2.0.0.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@v1.27.0...v2.0.0)

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

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

.github/workflows/slack-notification.yml

@@ -19,7 +19,7 @@ jobs:
       SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK
     steps:
     - name: Send failure message to Slack
-      uses: slackapi/slack-github-action@v1.27.0
+      uses: slackapi/slack-github-action@v2.0.0
       if: ${{ ! inputs.workflow_success }}
       with:
         # For posting a rich message using Block Kit
@@ -44,7 +44,7 @@ jobs:
             ]
           }
     - name: Send success message to Slack
-      uses: slackapi/slack-github-action@v1.27.0
+      uses: slackapi/slack-github-action@v2.0.0
       if: ${{ inputs.workflow_success }}
       with:
         payload: |