Update protobuf python package's version (#18203)
1. Now we use a released version of ONNX, so we can directly download a
prebuilt package from pypi.org. We do not need to build one from source.
2. Update protobuf python package's version to match the C/C++ version
we are using.
3. Update tensorboard python python because the current one is
incompatible with the newer protobuf version.
