Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-04-22 10:34 2deda90e

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feat(data/fin): help simp reduce expressions containing fin.succ_above (#7308) With these simp lemmas, in combination with #6897, simp; ring can almost automatically compute the determinant of matrices like ![![a, b], ![c, d]].

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