Bump docker build action.

Author: jum

.github/workflows/build.yaml

@@ -25,7 +25,7 @@ jobs:
         with:
           images: jumager/caddy
       - name: Build and push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
         with:
           push: ${{ github.event_name != 'pull_request' }}
           platforms: linux/amd64,linux/arm64