Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-06-07 10:28 0dc40792

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refactor(geometry/manifold/cont_mdiff_map): refactor to reduce imports (#19164) See https://tqft.net/mathlib4/2023-06-07/geometry.manifold.algebra.left_invariant_derivation.pdf for the motivation. I'm happy if this one is shot down. :-)

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