Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/balena.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: true
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       - uses: balena-io/deploy-to-balena-action@63a685c4b9c898c38e66776284a78c4e50ec8c97 # v2.0.136
         with:
           balena_token: ${{ secrets.BALENA_TOKEN }}