build: bump compat for ModelingToolkit to v9

AayushSabharwal · AayushSabharwal · commit b36b8908d969 · 2024-02-22T17:38:54.000+05:30
diff --git a/Project.toml b/Project.toml
@@ -19,7 +19,7 @@ DataInterpolations = "4"
 DiffEqBase = "6.103"
 IfElse = "0.1"
 LinearAlgebra = "1.10"
-ModelingToolkit = "8.69"
+ModelingToolkit = "9"
 OrdinaryDiffEq = "6.33"
 SafeTestsets = "0.1"
 Symbolics = "5.2"
