Improve bench_simplify.jl

Author: ufechner7

test/bench_simplify.jl

@@ -4,6 +4,9 @@
 SIMPLE = false
 T_REF = 48.0 # AMD Ryzen 7840U, Julia 1.11, no sys image [s]
              # 37s with sys image
+if VERSION.minor==12
+    T_REF /= 0.85 # Julia 1.12 is about 15% slower on AMD Ryzen 7 7840U
+end
 
 using Pkg
 if ! ("Test" ∈ keys(Pkg.project().dependencies))