package/wsapi-xavante: update the upstream URL in Config.in

Update the upstream URL in the help text in Config.in. This
addresses the 'Invalid(406)' URL status in the package stats
web page output.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/wsapi-xavante/Config.in

@@ -7,4 +7,4 @@ config BR2_PACKAGE_WSAPI_XAVANTE
 	  applications. This is the rock that contains the Xavante
 	  adapter and launcher.
 
-	  http://www.keplerproject.org/wsapi
+	  https://keplerproject.github.io/wsapi/