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

Author: hamzaremmal

library/src/scala/io/AnsiColor.scala

@@ -13,6 +13,8 @@
 package scala
 package io
 
+import scala.language.`2`
+
 /** ANSI escape codes providing control over text formatting and color on supporting text terminals.
   *
   * ==ANSI Style and Control Codes==

library/src/scala/io/BufferedSource.scala

@@ -12,6 +12,7 @@
 
 package scala.io
 
+import scala.language.`2`
 import java.io.{ InputStream, BufferedReader, InputStreamReader, PushbackReader }
 import Source.DefaultBufSize
 import scala.collection.{ Iterator, AbstractIterator }

library/src/scala/io/Codec.scala

@@ -13,6 +13,7 @@
 package scala
 package io
 
+import scala.language.`2`
 import java.nio.charset.{CharacterCodingException, Charset, CharsetDecoder, CharsetEncoder, CodingErrorAction => Action}
 import java.nio.charset.StandardCharsets.{ISO_8859_1, UTF_8}
 import scala.annotation.migration

library/src/scala/io/Position.scala

@@ -13,6 +13,7 @@
 package scala
 package io
 
+import scala.language.`2`
 import annotation.nowarn
 
 /** The object Position provides convenience methods to encode

library/src/scala/io/Source.scala

@@ -17,6 +17,7 @@ import scala.collection.{AbstractIterator, BufferedIterator}
 import java.io.{Closeable, FileInputStream, FileNotFoundException, InputStream, PrintStream, File => JFile}
 import java.net.{URI, URL}
 
+import scala.language.`2`
 import scala.annotation.nowarn
 
 /** This object provides convenience methods to create an iterable

library/src/scala/io/StdIn.scala

@@ -13,6 +13,7 @@
 package scala
 package io
 
+import scala.language.`2`
 import java.text.MessageFormat
 
 /** private[scala] because this is not functionality we should be providing