mailmap: update entry for Andy Yan

I will use andyshrk@163.com for future review and discussion.

Link: https://lore.kernel.org/20260924105052.768760-1-andyshrk@163.com
Signed-off-by: Andy Yan <andyshrk@163.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Cc: Alexander Sverdlin <alex@sverdlin.org>
Cc: Chuck Lever <cel@kernel.org>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Martin Kepplinger <martink@posteo.de>