compat: Allow Aqua 0.8

Aqua 0.6.7's type-piracy/ambiguity detection produces false positives under
JuliaLang/julia#61915 (the TypeEq refactor), flagging the package's own inner
constructors as piracy because Type{T} is now a TypeEq kind. Aqua 0.8.15 fixes
this (it uses Base.isType). Allow Aqua 0.8 so tests pass on recent Julia.

This change was made with the assistance of generative AI (Claude Code).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Keno

Project.toml

@@ -15,7 +15,7 @@ SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 QuadmathSpecialFunctionsExt = ["SpecialFunctions"]
 
 [compat]
-Aqua = "0.6"
+Aqua = "0.6, 0.8"
 Compat = "4.4"
 Printf = "<0.0.1, 1"
 Random = "<0.0.1, 1"