chore(group_theory/perm/sign): speed up sign_aux_swap_zero_one proof (#6128)
chore(group_theory/perm/sign): speed up sign_aux_swap_zero_one proof (#6128)




Co-authored-by: Yakov Pechersky <9925c0c20eafe10b1eaac37c5fe124dc0b28ca8c@users.noreply.github.com>

leanprover-community/mathlib,leanprover-community/mathlib