Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-07-24 16:34 aed4c494

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refactor(data/{finite,fintype}): move some lemmas to data.fintype.basic (#15626) We should have lemmas like nonempty_fintype in fintype.basic to replace [fintype _] by [finite _] in the assumptions. This PR doesn't fix any assumptions to keep it small.

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