chore(deps): update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/build.yaml

@@ -31,7 +31,7 @@ jobs:
             cnpg_version: 14.18-22
     steps:
       - name: Checkout
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       - name: Get CloudNativePG version
         id: cnpg
         env: