chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
       images: ${{ steps.images.outputs.images }}
     steps:
       - name: Checkout Code
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Log in to the GitHub Container registry
         uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3
@@ -83,7 +83,7 @@ jobs:
         image: ${{fromJson(needs.testbuild.outputs.images)}}
     steps:
       - name: Checkout Code
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Security checks
         uses: cloudnative-pg/postgres-containers/.github/actions/security-scans@main