fix: Remove unused dependency protobuf3-to-dict (#3964)

Author: knikure

setup.py

@@ -53,7 +53,6 @@ def read_requirements(filename):
     "google-pasta",
     "numpy>=1.9.0,<2.0",
     "protobuf>=3.1,<4.0",
-    "protobuf3-to-dict>=0.1.5,<1.0",
     "smdebug_rulesconfig==1.0.1",
     "importlib-metadata>=1.4.0,<5.0",
     "packaging>=20.0",