Update actions/checkout digest to df4cb1c

Author: renovate[bot]

.github/workflows/balena.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: true
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
       - uses: balena-io/deploy-to-balena-action@63a685c4b9c898c38e66776284a78c4e50ec8c97 # v2.0.136
         with:
           balena_token: ${{ secrets.BALENA_TOKEN }}