Update GitHub Actions to latest versions

Resolves warnings due to node.js versions which are going EOL. Tested in https://github.com/BenjaminEHowe/caprover-python-flask/blob/main/.github/workflows/docker-build-and-deploy.yaml.

docs/ci-cd-integration/deploy-from-github.md

@@ -61,7 +61,8 @@ jobs:
         node-version: [18.x]
 
     steps:
-      - uses: actions/checkout@v3
+      - name: Check out repository
+        uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with:
@@ -166,13 +167,13 @@ jobs:
 
     steps:
     - name: Check out repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v1
+      uses: docker/setup-buildx-action@v3
 
     - name: Login to Container Registry
-      uses: docker/login-action@v2
+      uses: docker/login-action@v3
       with:
             registry: ghcr.io
             username: ${{ github.repository_owner }}
@@ -182,7 +183,7 @@ jobs:
       run: echo "IMAGE_URL=$(echo ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}:$(echo ${{ github.sha }} | cut -c1-7) | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
 
     - name: Build and push Docker Image
-      uses: docker/build-push-action@v4
+      uses: docker/build-push-action@v5
       with:
         context: .
         file: ./Dockerfile