MAINTAINERS: update Yu Kuai's email address

Update Yu Kuai's maintainer entries to use the new fygo.io address.

Link: https://patch.msgid.link/20260520112627.1264368-1-yukuai@fnnas.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>

Author: Yu Kuai

MAINTAINERS

@@ -4478,7 +4478,7 @@ F:	Documentation/filesystems/befs.rst
 F:	fs/befs/
 
 BFQ I/O SCHEDULER
-M:	Yu Kuai <yukuai@fnnas.com>
+M:	Yu Kuai <yukuai@fygo.io>
 L:	linux-block@vger.kernel.org
 S:	Odd Fixes
 F:	Documentation/block/bfq-iosched.rst
@@ -24796,7 +24796,7 @@ F:	include/linux/property.h
 
 SOFTWARE RAID (Multiple Disks) SUPPORT
 M:	Song Liu <song@kernel.org>
-M:	Yu Kuai <yukuai@fnnas.com>
+M:	Yu Kuai <yukuai@fygo.io>
 R:	Li Nan <linan122@huawei.com>
 R:	Xiao Ni <xiao@kernel.org>
 L:	linux-raid@vger.kernel.org