Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-05-24 15:53 73a61259

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feat(linear_algebra/bilinear_form): generalize scalar instances, fix diamonds (#14358) This fixes the zsmul and nsmul diamonds, makes sub definitionally better, and makes the scalar instance apply more generally. This also adds linear_map.comp_bilin_form. These changes bring the API more in line with quadratic_form.

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