CompatHelper: bump compat for ModelingToolkit to 8, (drop existing compat)

Author: CompatHelper Julia

Project.toml

@@ -51,7 +51,7 @@ GeneralizedGenerated = "0.3.2"
 KernelDensity = "0.6.2"
 LineSearches = "7.1.1"
 Memoize = "0.4.4"
-ModelingToolkit = "5.6.4"
+ModelingToolkit = "8"
 NLsolve = "4.5.1"
 OrdinaryDiffEq = "5.49.1"
 PhysicalConstants = "0.2.1"