Update the upstream URL in the help text in Config.in. This
addresses the 'Invalid(404)' URL status in the package stats
web page output.
Signed-off-by: Mark Corbin <mark@dibsco.co.uk> Acked-by: Alexander Dahl <post@lespocky.de> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>