Revert "protobuf < 6.0"

This reverts commit 48bb4b4.

Author: danieldk

server/pyproject.toml

@@ -25,7 +25,7 @@ dependencies = [
     "opentelemetry-instrumentation-grpc>=0.50b0",
     "pillow>=11.1.0",
     "prometheus-client>=0.21.0",
-    "protobuf>=5.28.3,<6.0",
+    "protobuf>=5.28.3",
     "py-cpuinfo>=9.0.0",
     "rich>=13.8.1",
     "safetensors>=0.4.5",