Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-10-29 19:43 c722dae6

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chore(data/fintype/basic): add a few infinite instances (#10037)

Estimated changes

Modified src/data/fintype/basic.lean

deleted theorem infinite.nonempty

Modified src/data/multiset/basic.lean

added theorem multiset.repeat_injective