This reverts commit  74b5a93 .
Stop using `pip` to install dependencies on Python 3.10 on public CI.
This configuration was put in place during a time where not many conda
packages were available for Numba's dependencies. Ideally this should no
longer be the case. This PR will test that hypothesis and fix the
configuration once all packages do become available.

esc changed the title Revert "start testing Python 3.10 on public CI" Stop using pip for 3.10 on public ci (Revert "start testing Python 3.10 on public CI")

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