MAINTAINERS: Remove stale URLs for cpuset

Those URLs are no longer accessable.

Reported-by: Steve Wahl <steve.wahl@hpe.com>
Signed-off-by: Zefan Li <lizefan.x@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

Author: lizefan-byte

MAINTAINERS

@@ -4492,8 +4492,6 @@ CONTROL GROUP - CPUSET
 M:	Li Zefan <lizefan@huawei.com>
 L:	cgroups@vger.kernel.org
 S:	Maintained
-W:	http://www.bullopensource.org/cpuset/
-W:	http://oss.sgi.com/projects/cpusets/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git
 F:	Documentation/admin-guide/cgroup-v1/cpusets.rst
 F:	include/linux/cpuset.h