Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-06-01 08:55 67237461

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chore(field_theory/ratfunc): use section instead of omit/include (#19133) This hopefully closes [#4513](https://github.com/leanprover-community/mathlib4/issues/4513) (or at least mitigates it) and will settle [!4#4373](https://github.com/leanprover-community/mathlib4/pull/4373) in mathlib3.

Estimated changes