chore(deps): update docker/setup-buildx-action action to v4

.gitea/workflows/pr.yml

@@ -75,7 +75,7 @@ jobs:
           echo "tag=${REGISTRY}/${{ github.repository }}:latest" >> $GITHUB_OUTPUT
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Build (dry run)
         uses: docker/build-push-action@v6

.gitea/workflows/push.yml

@@ -29,7 +29,7 @@ jobs:
           echo "${{ secrets.GITEA_REGISTRY_TOKEN }}" | docker login "$REGISTRY" -u "${{ github.actor }}" --password-stdin
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Build Docker image
         uses: docker/build-push-action@v6