Remove --use-feature=2020-resolver
command line option for obsolete pip 2020 solver
#2493
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Description
Pip introduced a more robust but different dependency resolver back when were were all working from home (sneaky! 😁 ), see communication release and that was breaking some stuffs back then, now it's the default resolver and the call to use the older resolver is deprecated and will introduce an error if used 👍 🍺
Just like in ESMValGroup/ESMValCore#1357
Tests all ok bar one related to pymon-journal that @zklaus has already flagged
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