fixes

Author: ParamThakkar123

lib/OrdinaryDiffEqRosenbrock/src/rosenbrock_caches.jl

@@ -703,7 +703,6 @@ struct Rodas4ConstantCache{TF, UF, Tab, JType, WType, F, AD} <: RosenbrockConsta
     tab::Tab
     J::JType
     W::WType
-    du::rateType
     linsolve::F
     autodiff::AD
 end