Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-04 08:27 4f3245c3

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feat(topology/continuous_function/basic): inverse equations for homeomorph.to_continuous_map (#15708) This PR adds two lemmas stating the left and right inverse of an homeomorph.to_continuous_map: -homeomorph.symm_comp_to_continuous_map, and -homeomorph.comp_symm_to_continuous_map Suggested by: @alreadydone

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