Update GitHub Actions versions

Author: jdubois

.github/workflows/docker.yml

@@ -40,20 +40,20 @@ jobs:
 
       - name: Login to GitHub Container Registry
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1.10.0
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@v3.5.0
+        uses: docker/metadata-action@v4
         with:
           images: ghcr.io/${{ github.repository }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v4
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}