MAINTAINERS: Change Yanteng's email address

I'm no longer work for Loongson, so I have permanently
lost my Loongson email account.

Signed-off-by: Yanteng Si <[email protected]>
Link: https://lore.kernel.org/r/403fa4722ad008800086e41d412cd322243b9089.1743156287.git.si.yanteng@linux.dev
Signed-off-by: Alex Shi <[email protected]>

Author: sterling-teng

MAINTAINERS

@@ -5502,7 +5502,7 @@ F:	Documentation/dev-tools/checkpatch.rst
 
 CHINESE DOCUMENTATION
 M:	Alex Shi <[email protected]>
-M:	Yanteng Si <[email protected]>
+M:	Yanteng Si <[email protected]>
 R:	Dongliang Mu <[email protected]>
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/alexs/linux.git
 S:	Maintained