Ensure we have the latest pip version in build environments #30
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I noticed that our CI with macOS environment occasionally fails.
This PR fixes it by ensuring that we use the latest version of
pip
in build envs.According to the log, it seems that
tenacity
which is vendored inpip
fails to importingtornado
modules. The issues here seems to be solved at pypa/pip#10029, and the latest release (21.1.3) contains it.