Fix experimental definition test

Author: liufengyun

tests/run-custom-args/tasty-inspector/stdlibExperimentalDefinitions.scala

@@ -63,6 +63,12 @@ val experimentalDefinitionInLibrary = Set(
   //// New feature: Macro annotations
   "scala.annotation.MacroAnnotation",
 
+  //// New feature: -Ysafe-init-global
+  "scala.annotation.init",
+  "scala.annotation.init$",
+  "scala.annotation.init$.widen",
+  "scala.annotation.init$.region",
+
    //// New APIs: Quotes
   // Should be stabilized in 3.4.0
   "scala.quoted.Quotes.reflectModule.defnModule.FunctionClass",