Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-03-12 02:28 2e7483d2

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refactor(group_theory/commutator): Move and golf commutator_le (#12599) This PR golfs commutator_le and moves it earlier in the file so that it can be used earlier. This PR will conflict with #12600, so don't merge them simultaneously (bors d+ might be better).

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