[Gradle] Remove deprecated experimental annotation methods & properties

#KT-47763 Fixed

libraries/tools/kotlin-project-model/src/main/kotlin/LanguageSettings.kt

@@ -11,7 +11,5 @@ interface LanguageSettings {
     val progressiveMode: Boolean
     val enabledLanguageFeatures: Set<String>
 
-    @Deprecated("Unsupported and will be removed in next major releases", replaceWith = ReplaceWith("optInAnnotationsInUse"))
-    val experimentalAnnotationsInUse: Set<String>
     val optInAnnotationsInUse: Set<String>
 }