Update rust maintainers in openharmony.md

Author: huaihuaidelulu

src/doc/rustc/src/platform-support/openharmony.md

@@ -16,7 +16,7 @@ system.
 ## Target maintainers
 
 [@Amanieu](https://github.com/Amanieu)
-[@lubinglun](https://github.com/lubinglun)
+[@cceerczw](https://github.com/cceerczw)
 
 ## Requirements