sparse: update MAINTAINERS info

Chris Li is back as sparse maintainer.

See https://git.kernel.org/pub/scm/devel/sparse/sparse.git/commit/?id=67f0a03cee4637e495151c48a02be642a158cbbb

Link: https://lkml.kernel.org/r/20251218060921.995516-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Christopher Li <sparse@chrisli.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: rddunlap

MAINTAINERS

@@ -24574,7 +24574,7 @@ F:	drivers/tty/vcc.c
 F:	include/linux/sunserialcore.h
 
 SPARSE CHECKER
-M:	"Luc Van Oostenryck" <luc.vanoostenryck@gmail.com>
+M:	Chris Li <sparse@chrisli.org>
 L:	linux-sparse@vger.kernel.org
 S:	Maintained
 W:	https://sparse.docs.kernel.org/