Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-14 17:09 ad5edeb5

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feat(algebra/big_operators): prod_ite_irrel (#14142) A few missing lemams in big_operators/basic.lean.

Estimated changes

modified theorem finset.prod_dite_irrel
added theorem finset.prod_ite_irrel