message: Fix the Protobuf version requirement for Pypi
diff: @@ -54,7 +54,8 @@ REQUIRED_PACKAGES = [
  # TODO(b/187981032): remove the constraint for 2.0 once the incompatibile
  # issue is resolved.
  'flatbuffers >= 1.12, <2',
  - 'protobuf >= 3.18.0',
  + # The Protobuf version needs to be the same as the one in WORKSPACE.
  + 'protobuf == 3.18.0',
  ] + SETUP_PACKAGES
  project_name = 'tflite-support'
  