Revert "backport-action: 0.0.5 -> 0.0.8"

.github/workflows/backport.yml

@@ -22,13 +22,18 @@ jobs:
     steps:
       - uses: actions/checkout@v3
         with:
+          # required to find all branches
+          fetch-depth: 0
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Create backport PRs
-        uses: zeebe-io/backport-action@v0.0.8
+        # should be kept in sync with `version`
+        uses: zeebe-io/backport-action@v0.0.5
         with:
           # Config README: https://github.com/zeebe-io/backport-action#backport-action
           github_token: ${{ secrets.GITHUB_TOKEN }}
           github_workspace: ${{ github.workspace }}
+          # should be kept in sync with `uses`
+          version: v0.0.5
           pull_description: |-
             Bot-based backport to `${target_branch}`, triggered by a label in #${pull_number}.