Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-28 17:52 f13e5dfd

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refactor(set_theory/*) rename wf lemmas to lt_wf (#14417) This is done for consistency with the rest of mathlib (nat.lt_wf, enat.lt_wf, finset.lt_wf, ...)

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