fix(io): import CharBuffer from java.nio

Author: cesarcoatl

src/java/io/__init__.py

@@ -36,13 +36,13 @@
 from java.lang import (
     Appendable,
     AutoCloseable,
-    CharBuffer,
     CharSequence,
     Exception,
     Object,
     Readable,
     Throwable,
 )
+from java.nio import CharBuffer
 from java.nio.channels import FileChannel
 from java.nio.charset import Charset, CharsetDecoder
 

stubs/stubs/java/io/__init__.pyi

@@ -3,13 +3,13 @@ from typing import Any, Optional, Union
 from java.lang import (
     Appendable,
     AutoCloseable,
-    CharBuffer,
     CharSequence,
     Exception,
     Object,
     Readable,
     Throwable,
 )
+from java.nio import CharBuffer
 from java.nio.channels import FileChannel
 from java.nio.charset import Charset, CharsetDecoder