Upgrade protobuf to prevent conflicts with smdebugger. (#169)

Author: josephevans

setup.py

@@ -40,7 +40,7 @@ def read_version():
     "werkzeug>=0.15.5",
     "paramiko>=2.4.2",
     "psutil>=5.6.7",
-    "protobuf>=3.9.2,<3.20",
+    "protobuf>=3.9.2,<=3.20.2",
     "scipy>=1.2.2",
 ]