package/libfcgi: update the upstream URL in Config.in

Update the upstream URL in the help text in Config.in. This
addresses the 'Invalid(Err)' 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/libfcgi/Config.in

@@ -4,4 +4,4 @@ config BR2_PACKAGE_LIBFCGI
 	help
 	  FCGI, a fastcgi developer library for C/C++
 
-	  http://www.fastcgi.com/
+	  https://fastcgi-archives.github.io/