lua-*: fix upstream URL in Config.in
like in https://git.busybox.net/buildroot/commit/?id=05200ad01434ce297a166c6e1bebc8196c18f7dc
Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>