Update auto-generated *_pb2.py files

[ods]

Without this update we get warnings when using reflection or health:

  File "/usr/local/lib/python3.8/site-packages/grpclib/reflection/service.py", line 27, in <module>
    from .v1.reflection_pb2 import ServerReflectionRequest, ServerReflectionResponse
  File "/usr/local/lib/python3.8/site-packages/grpclib/reflection/v1/reflection_pb2.py", line 16, in <module>
    DESCRIPTOR = _descriptor.FileDescriptor(
  File "/usr/local/lib/python3.8/site-packages/google/protobuf/descriptor.py", line 993, in __init__
    _Deprecated('FileDescriptor')
  File "/usr/local/lib/python3.8/site-packages/google/protobuf/descriptor.py", line 98, in _Deprecated
    warnings.warn(
DeprecationWarning: Call to deprecated create function FileDescriptor(). Note: Create unlinked descriptors is going to go away. Please use get/find descriptors from generated code or query the descriptor_pool.

[vmagamedov]

This deprecation warning is caused by old protobuf package, not by old stub files. I intentionally didn't wanted to regenerate new stub files for backward compatibility. Google broke backward compatibility in their stub files, you can't use new stub files with older protobuf package (before 3.12.0). I also wasn't able to find any improvements in new stub files, but it was a long time ago.

In order to suppress these warnings I propose to upgrade protobuf package in the project requirements files.

[vmagamedov]

Hmm, there are warnings in the source code:

https://github.com/protocolbuffers/protobuf/blob/4f49062a95f18a6c7e21ba17715a2b0a4608151a/python/google/protobuf/descriptor.py#L576-L577

But they don't work when you use C implementation of protobuf. Python 3.9 and protobuf==3.17.3:

$ python -W default -c "import grpclib.health.v1.health_pb2"
$ PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python python -W default -c "import grpclib.health.v1.health_pb2"
grpclib/health/v1/health_pb2.py:16: DeprecationWarning: Call to deprecated create function FileDescriptor(). Note: Create unlinked descriptors is going to go away. Please use get/find descriptors from generated code or query the descriptor_pool.
  DESCRIPTOR = _descriptor.FileDescriptor(
...