Upgrade docker/build-push-action (#383)

Author: benbjohnson

.github/workflows/docker_image.yml

@@ -47,7 +47,7 @@ jobs:
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
 
-      - uses: docker/build-push-action@v3
+      - uses: docker/build-push-action@v4
         with:
           context: .
           push: ${{ steps.login.outcome != 'skipped' }}