micropython: update to fix build issue

lang/micropython/Makefile

@@ -17,7 +17,7 @@ PKG_LICENSE_FILES:=LICENSE
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/micropython/micropython.git
-PKG_SOURCE_VERSION:=035deae1c6fb02f6754a21486966f76c02b64c98
+PKG_SOURCE_VERSION:=9220dc466a8d098ed669a33a617edd1118a3e35d
 
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE:=$(PKG_SOURCE_SUBDIR).tar.gz