Merge pull request 'Update docker/setup-buildx-action action to v4' (#4) from renovate/docker-setup-buildx-action-4.x into master

Reviewed-on: #4

.gitea/workflows/docker-build-gitea.yml

@@ -15,7 +15,7 @@ jobs:
       uses: actions/checkout@v7
     
     - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v3
+      uses: docker/setup-buildx-action@v4
     
     - name: Login to Gitea
       uses: docker/login-action@v4