chore(deps): update actions/checkout digest to 71cf226

Author: renovate[bot]

.github/workflows/backport.yaml

@@ -38,7 +38,7 @@ jobs:
 
       # This is required for backport action to cherry-pick the PR
       - name: Fetch PR ref
-        uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493
+        uses: actions/checkout@71cf2267d89c5cb81562390fa70a37fa40b1305e
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           token: ${{ steps.app-token.outputs.token }}