chore: revert backport action (#6067)

.github/workflows/backport.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ${{ fromJSON(vars.RUNNER) }}
     container: hashicorpdev/backport-assistant:0.5.1
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           fetch-depth: 0 # Fetch all branches and tags
       - name: Check if any migrations have changed