Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-02-01 12:38 d7859726

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refactor(data/fintype/basic): move fin_choice to a new file (#18337) There is a refactor in the works for these definitions; it will be easier to review and port the refactor if we move this all to a new file first and just forward-port the deletion.

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