docs: update docs compat for MTKv9

AayushSabharwal · AayushSabharwal · commit c2c0c293ef99 · 2024-03-05T10:54:43.000+05:30
diff --git a/docs/Project.toml b/docs/Project.toml
@@ -5,5 +5,5 @@ SciMLBase = "0bca4576-84f4-4d90-8ffe-ffa030f20462"
 
 [compat]
 Documenter = "1"
-ModelingToolkit = "8.35"
+ModelingToolkit = "8.35, 9"
 SciMLBase = "1.74, 2"
