Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-03-10 09:02 1e560a67

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refactor(group_theory/commutator): Generalize map_commutator_element (#12555) This PR generalizes map_commutator_element from monoid_hom_class F G G to monoid_hom_class F G G'.

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