Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-09-27 00:15 e46daa0a

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feat(analysis/normed_space/operator_norm): remove to_span_singleton_norm (#16654) Remove continuous_linear_map.to_span_singleton_norm. It is a duplicate of continuous_linear_map.norm_to_span_singleton (which has more explicit arguments and weaker type-class assumptions).

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