MAINTAINERS: update overlayfs git tree

Overlayfs has moved to group maintanance.

Signed-off-by: Amir Goldstein <[email protected]>

Author: amir73il

MAINTAINERS

@@ -16580,7 +16580,7 @@ M:	Miklos Szeredi <[email protected]>
 M:	Amir Goldstein <[email protected]>
 L:	[email protected]
 S:	Supported
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs.git
 F:	Documentation/filesystems/overlayfs.rst
 F:	fs/overlayfs/