fix: remove usage of non-primary SymbolicUtils branch

Author: AayushSabharwal

benchmarks/Symbolics/BCR.jmd

@@ -17,10 +17,6 @@ jacobian, generate a function to calculate it and call the function.
 
 
 ```julia
-using Pkg
-
-Pkg.add(Pkg.PackageSpec(;name="SymbolicUtils", rev="775efa7556f986087562f2a32873fa1f7bcf173c"))
-
 using Catalyst, ReactionNetworkImporters,
     TimerOutputs, LinearAlgebra, ModelingToolkit, Chairmarks,
     LinearSolve, Symbolics, SymbolicUtils, SymbolicUtils.Code, SparseArrays, CairoMakie,

benchmarks/Symbolics/ThermalFluid.jmd

@@ -9,7 +9,6 @@ This is a 1D advection-diffusion-source PDE that uses a second order upwind sche
 using Pkg
 # Rev fixes precompilation https://github.com/hzgzh/XSteam.jl/pull/2
 Pkg.add(Pkg.PackageSpec(;name="XSteam", rev="f2a1c589054cfd6bba307985a3a534b6f5a1863b"))
-Pkg.add(Pkg.PackageSpec(;name="SymbolicUtils", rev="775efa7556f986087562f2a32873fa1f7bcf173c"))
 
 using ModelingToolkit, Symbolics, SymbolicUtils, XSteam, Polynomials, CairoMakie, PrettyTables
 using SparseArrays, Chairmarks, Statistics