Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-10-27 15:13 a3f4a025

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chore(analysis/normed_space/is_R_or_C + data/complex/is_R_or_C): make some proof steps standalone lemmas (#9933) Separate some proof steps from linear_map.bound_of_sphere_bound as standalone lemmas to golf them a little bit.

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