Enable Kotlin explicit API mode for androidx keep annotations

Bug: b/392865072
Change-Id: If618e6d8966230066bd236c2757b830e5b98f78e
diff --git a/src/keepanno/java/androidx/annotation/keep/KeepCondition.kt b/src/keepanno/java/androidx/annotation/keep/KeepCondition.kt
index a4fcddc..e149232 100644
--- a/src/keepanno/java/androidx/annotation/keep/KeepCondition.kt
+++ b/src/keepanno/java/androidx/annotation/keep/KeepCondition.kt
@@ -41,7 +41,7 @@
  */
 @Retention(AnnotationRetention.BINARY)
 @Target(AnnotationTarget.ANNOTATION_CLASS)
-annotation class KeepCondition(
+public annotation class KeepCondition(
 
   /**
    * Define the class pattern by reference to a binding.