Enable Kotlin explicit API mode for androidx keep annotations

Bug: b/392865072
Change-Id: If618e6d8966230066bd236c2757b830e5b98f78e
diff --git a/src/keepanno/java/androidx/annotation/keep/CheckRemoved.kt b/src/keepanno/java/androidx/annotation/keep/CheckRemoved.kt
index 0be0daa..66117a2 100644
--- a/src/keepanno/java/androidx/annotation/keep/CheckRemoved.kt
+++ b/src/keepanno/java/androidx/annotation/keep/CheckRemoved.kt
@@ -39,4 +39,4 @@
   AnnotationTarget.FUNCTION,
   AnnotationTarget.CONSTRUCTOR,
 )
-annotation class CheckRemoved(val description: String = "")
+public annotation class CheckRemoved(val description: String = "")