Use actions/checkout@v4

Author: Stormheg

.github/workflows/docker.yml

@@ -12,7 +12,7 @@ jobs:
   build-container:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Build container
         run: docker compose build && docker compose pull
       - name: Run migrations