Merge pull request scala#11091 from hamzaremmal/stdlib-codeowners

chore: add stdlib in CODEOWNERS

Author: lrytz

.github/CODEOWNERS

@@ -1,3 +1,8 @@
 # Files of which NthPortal has a lot of knowledge. Wildcards cover tests
 *LazyList*  @NthPortal
 **/scala/util/Using*  @NthPortal
+
+# Any changes to the Scala 2 Standard Library must be approve
+# by one of the officers responsible of maintaining it
+/src/library/      @scala/stdlib-officers
+/src/library-aux/  @scala/stdlib-officers