MAINTAINERS: Update Landlock repository

I only use the kernel.org repository for Landlock.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Link: https://lore.kernel.org/r/20230209223814.308370-1-mic@digikod.net
Reviewed-by: Paul Moore <paul@paul-moore.com>

MAINTAINERS

@@ -11686,7 +11686,7 @@ M:	Mickaël Salaün <mic@digikod.net>
 L:	linux-security-module@vger.kernel.org
 S:	Supported
 W:	https://landlock.io
-T:	git https://github.com/landlock-lsm/linux.git
+T:	git https://git.kernel.org/pub/scm/linux/kernel/git/mic/linux.git
 F:	Documentation/security/landlock.rst
 F:	Documentation/userspace-api/landlock.rst
 F:	include/uapi/linux/landlock.h