[deps] Use protobuf < 4.0 in py.

[fishbone]

Why are these changes needed?

Test failed due to protobuf version problem:

(raylet) More information: https://developers.google.com/protocol-buffers/docs/news/2022-05-06#python-updates
  | (raylet) [2022-05-26 01:52:27,562 E 10316 10316] (raylet) worker_pool.cc:498: Some workers of the worker process(11044) have not registered within the timeout. The process is dead, probably it crashed during start.
  | (raylet) Traceback (most recent call last):
  | (raylet)   File "/ray/python/ray/workers/default_worker.py", line 8, in <module>
  | (raylet)     import ray
  | (raylet)   File "/ray/python/ray/__init__.py", line 115, in <module>
  | (raylet)     import ray._raylet  # noqa: E402
  | (raylet)   File "python/ray/_raylet.pyx", line 116, in init ray._raylet
  | (raylet)   File "/ray/python/ray/exceptions.py", line 7, in <module>
  | (raylet)     from ray.core.generated.common_pb2 import RayException, Language, PYTHON
  | (raylet)   File "/ray/python/ray/core/generated/common_pb2.py", line 15, in <module>
  | (raylet)     from . import runtime_env_common_pb2 as src_dot_ray_dot_protobuf_dot_runtime__env__common__pb2
  | (raylet)   File "/ray/python/ray/core/generated/runtime_env_common_pb2.py", line 42, in <module>
  | (raylet)     serialized_options=None, json_name='packages', file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
  | (raylet)   File "/tmp/ray/session_2022-05-26_01-42-02_431980_9214/runtime_resources/conda/a6ff561ba9229e48b1e71b5dba39510e8d1ba907/lib/python3.7/site-packages/google/protobuf/descriptor.py", line 560, in __new__
  | (raylet)     _message.Message._CheckCalledFromGeneratedFile()
  | (raylet) TypeError: Descriptors cannot not be created directly.
  | (raylet) If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.
  | (raylet) If you cannot immediately regenerate your protos, some other possible workarounds are:
  | (raylet)  1. Downgrade the protobuf package to 3.20.x or lower.
  | (raylet)  2. Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will use pure-Python parsing and will be much slower).-- Test timed out at 2022-05-26 01:55:19 UTC --

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Checks

• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

[krfricke]

Thanks, this currently break CI completely

[ddelange]

@amogkam is there any timeline for the release of this high-impact patch?

[ddelange]

upstream issue ref protocolbuffers/protobuf#10051 (comment)

[pcmoritz]

@ddelange It will be part of the Ray 1.13 release, which is due in the next couple of days :)