Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-07-17 04:14 5a6671a7

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chore(order/basic): remove two lemmas breaking API boundaries (#15401) order.dual_le and order.dual_lt don't conform to API boundaries, as they abuse the def-eq between αᵒᵈ and α instead of using to_dual or of_dual to perform the cast. As such, we remove them.

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