Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-04-13 23:29 0765994d

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chore(order/category/Preorder): reduce imports (#13301) Because punit_instances comes at the very end of the algebraic import hierarchy, we were requiring the entire algebraic hierarchy before we could begin compiling the theory of categorical limits. This tweak substantially reduces the import dependencies.

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