Update actions/checkout digest to a5ac7e5

Update actions/checkout
Changelog-entry: Update actions/checkout to a5ac7e51b41094c92402da3b24376905380afc29

Author: balena-renovate[bot]

.github/workflows/repo-sync.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       # https://github.com/actions/checkout
       - name: Checkout
-        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4
         with:
           persist-credentials: false