Update docker/setup-buildx-action action to v4

.gitea/workflows/docker-build.yml

@@ -7,11 +7,11 @@ jobs:
     runs-on: ubuntu
     steps:
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       - name: Check out repository code
         uses: actions/checkout@v6
       - name: Login to Docker Registry
-        uses: docker/login-action@v4
+        uses: docker/login-action@v3
         with:
           registry: gitea.henriburau.de
           username: ${{ gitea.actor }}