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Fix Mathlib.LinearAlgebra.SymplecticGroup#183

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mpenciak wants to merge 1 commit intoleanprover-community:lean-pr-testing-12564from
mpenciak:fix_symplectic_group
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Fix Mathlib.LinearAlgebra.SymplecticGroup#183
mpenciak wants to merge 1 commit intoleanprover-community:lean-pr-testing-12564from
mpenciak:fix_symplectic_group

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Fixed up the two proofs that were broken due to the changes in leanprover/lean4#12564.

The fixes both amount to introducing by hand an instance for Module R (Matrix (l ⊕ l) (l ⊕ l) R) so that neg_smul and neg_smul_neg can fire in the places with the sorrys


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