package/python-asgiref: switch upstream URL to https

Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/python-asgiref/Config.in

@@ -11,4 +11,4 @@ config BR2_PACKAGE_PYTHON_ASGIREF
 	    - Server base classes, asgiref.server
 	    - A WSGI-to-ASGI adapter, in asgiref.wsgi
 
-	  http://github.com/django/asgiref/
+	  https://github.com/django/asgiref/