Update zeebe-io/backport-action action to v1.4.0

Author: renovate[bot]

.github/workflows/backport.yml

@@ -27,7 +27,7 @@ jobs:
           fetch-depth: 0
 
       - name: Open Backport PR
-        uses: zeebe-io/backport-action@bf5fdd624b35f95d5b85991a728bd5744e8c6cf2 # v1.3.1
+        uses: zeebe-io/backport-action@bd68141f079bd036e45ea8149bc9d174d5a04703 # v1.4.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           github_workspace: ${{ github.workspace }}

.github/workflows/commands.yml

@@ -85,7 +85,7 @@ jobs:
         fetch-depth: 0
 
     - name: Open Backport PR
-      uses: zeebe-io/backport-action@bf5fdd624b35f95d5b85991a728bd5744e8c6cf2 # v1.3.1
+      uses: zeebe-io/backport-action@bd68141f079bd036e45ea8149bc9d174d5a04703 # v1.4.0
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
         github_workspace: ${{ github.workspace }}