chore(deps): update docker/setup-buildx-action action to v3

Author: renovate[bot]

.github/workflows/docker-php7.4.yml

@@ -14,7 +14,7 @@ jobs:
         id: vars
         run: echo ::set-output name=tag::$
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v3
       - name: Login to DockerHub
         uses: docker/login-action@v1
         with: