Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-11-13 14:24 b91d3449

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chore(data/equiv/*): rename trans_symm and symm_trans to self_trans_symm and symm_trans_self. (#10309) This frees up symm_trans to state (a.trans b).symm = a.symm.trans b.symm. These names are consistent with self_comp_symm and symm_comp_self.

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