github-actions: bump slackapi/slack-github-action from 2.0.0 to 2.1.1

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 2.0.0 to 2.1.1.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@v2.0.0...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-minor
...

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

Author: dependabot[bot]

.github/workflows/_deploy.yml

@@ -205,7 +205,7 @@ jobs:
         uses: ./.github/actions/catch-failed-step
       - name: Send job result to slack
         id: slack
-        uses: slackapi/slack-github-action@v2.0.0
+        uses: slackapi/slack-github-action@v2.1.1
         with:
           webhook-type: webhook-trigger
           payload: |

.github/workflows/_deploy_backups.yml

@@ -143,7 +143,7 @@ jobs:
         uses: ./.github/actions/catch-failed-step
       - name: Send job result to slack
         id: slack
-        uses: slackapi/slack-github-action@v2.0.0
+        uses: slackapi/slack-github-action@v2.1.1
         with:
           webhook-type: webhook-trigger
           payload: |

.github/workflows/merge.yml

@@ -87,7 +87,7 @@ jobs:
         uses: ./.github/actions/catch-failed-step
       - name: Send merge result to slack
         id: slack
-        uses: slackapi/slack-github-action@v2.0.0
+        uses: slackapi/slack-github-action@v2.1.1
         with:
           webhook-type: webhook-trigger
           payload: |