Chore: (deps): Bump zeebe-io/backport-action from 1.4.0 to 2.1.1 (#6399)

Bumps [zeebe-io/backport-action](https://github.com/zeebe-io/backport-action) from 1.4.0 to 2.1.1.
- [Release notes](https://github.com/zeebe-io/backport-action/releases)
- [Commits](bd68141f07...08bafb375e)

---
updated-dependencies:
- dependency-name: zeebe-io/backport-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/back-port.yml

@@ -22,7 +22,7 @@ jobs:
           fetch-depth: 0
 
       - name: Open Backport PR
-        uses: zeebe-io/backport-action@bd68141f079bd036e45ea8149bc9d174d5a04703
+        uses: zeebe-io/backport-action@08bafb375e6e9a9a2b53a744b987e5d81a133191
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           github_workspace: ${{ github.workspace }}

.github/workflows/issue-commands.yml

@@ -80,7 +80,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Open Backport PR
-        uses: zeebe-io/backport-action@bd68141f079bd036e45ea8149bc9d174d5a04703
+        uses: zeebe-io/backport-action@08bafb375e6e9a9a2b53a744b987e5d81a133191
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           github_workspace: ${{ github.workspace }}