Fix _matfun for Hermitian{ComplexF64} on all Julia versions

Hermitian{ComplexF64} input with real eigenvalue output must always
return Hermitian (conjugate symmetry), not Symmetric (mirror symmetry).
The previous code returned Symmetric on Julia < 1.12, causing value
mismatches in tests.

Now the version check only applies to Hermitian{Float64} (real element
type), where Julia 1.6 returns Symmetric and Julia 1.12+ returns
Hermitian.

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: claude

src/rulesets/LinearAlgebra/symmetric.jl

@@ -386,8 +386,9 @@ function _matfun(f, A::LinearAlgebra.RealHermSymComplexHerm)
     elseif eltype(fλ) <: Complex
         # Complex input with complex output: plain Matrix
         fA
-    elseif A isa Hermitian && VERSION >= v"1.12.0-DEV.0"
-        # Julia 1.12+ returns Hermitian for Hermitian input with real output
+    elseif A isa Hermitian && (eltype(A) <: Complex || VERSION >= v"1.12.0-DEV.0")
+        # Complex Hermitian input with real output: always Hermitian (conjugate symmetry)
+        # Real Hermitian input with real output: Hermitian on Julia 1.12+, Symmetric before
         Hermitian(fA)
     else
         Symmetric(fA)