chore: add scala.language.2 to files in scala.beans

Author: hamzaremmal

library/src/scala/beans/BeanProperty.scala

@@ -12,6 +12,8 @@
 
 package scala.beans
 
+import scala.language.`2`
+
 import scala.annotation.meta.{beanGetter, beanSetter, field}
 
 /** When attached to a field, this annotation adds a setter and a getter

library/src/scala/beans/BooleanBeanProperty.scala

@@ -12,6 +12,7 @@
 
 package scala.beans
 
+import scala.language.`2`
 import scala.annotation.meta.{beanGetter, beanSetter, field}
 
 /** This annotation has the same functionality as