Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-07-12 16:03 6fa678fb

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feat(ring_theory): coe_submodule S (⊤ : ideal R) = 1 (#8272) A little simp lemma and its dependencies. As I was implementing it, I saw the definition of has_one (submodule R A) can be cleaned up a bit.

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