Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-10-01 18:32 567220c2

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refactor(analysis/inner_product_space/pi_L2): Delete orthonormal_basis_index (#16698) std_orthonormal_basis was indexed by orthonormal_basis_index while it can simply be indexed by fin (finrank 𝕜 E). As a result, fin_std_orthonormal_basis becomes a trivial reindexation of std_orthonormal_basis so we delete it.

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