CI: Pin protobuf to latest 3.20 release #4939
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PyTorchships proto files which are incompatible withprotobuf >=4but there is no dependency version specification limiting that.For it doesn't seem that
pytorchintends to support4.*pythonprotobuf(see pytorch/pytorch#78362, as well as protobuf versions are pinned in CI).NOTE: this is only required for
pytorch <2.1. Pytorch since 2.1 seems to support newer protobuf.Previously,
TensorBoardhad a version specifier limitingprotobufversion for this specific reason, but with tensorflow/tensorboard#6147 merged (released with2.12.0) - it supports protobuf4.*and version specifier is relaxed to include4.*.Fixes: #4945