MAINTAINERS: update ieee802154 project website URL

Update URL to our new home.

Signed-off-by: Stefan Schmidt <[email protected]>

Author: Stefan-Schmidt

MAINTAINERS

@@ -8333,7 +8333,7 @@ M:	Alexander Aring <[email protected]>
 M:	Stefan Schmidt <[email protected]>
 L:	[email protected]
 S:	Maintained
-W:	http://wpan.cakelab.org/
+W:	https://linux-wpan.org/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan.git
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next.git
 F:	Documentation/networking/ieee802154.rst