Update actions/checkout action to v4

.github/workflows/docker.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v2

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the codebase.
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           # Full git history is needed to get a proper list of changed files
           fetch-depth: 0

.github/workflows/stack-healthcheck.yml

@@ -10,7 +10,7 @@ jobs:
     name: Test Stack
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: Deploy the stack, timeout if not healthy after 2m
         run: timeout 120 docker compose up --quiet-pull --wait
       - name: Check creating database