Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-12-02 19:28 4cfe637b

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chore(category_theory/sites/*): Adjust some simp lemmas. (#10574) The primary change is removing some simp tags from the definition of sheafify and friends, so that the sheafification related constructions are not unfolded to the plus constructions. Also -- added coercion from Sheaves to presheaves, and some rfl simp lemmas which help some proofs move along. Some proofs cleaned up as well.

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