Upgrade glib-networking to version 2.38.2 to match glib

With the current version of glib-networking (2.29.9) an attempt to establish SSL connection via libsoup results in the following warning:

GLib-GIO-WARNING **: gtlsconnection.c:329: invalid property id 5 for "database" of type 'GParamObject' in 'GTlsClientConnectionGnutls'

SSL connection seems to work though. However I think it's generally a good idea to have versions of glib-networking and glib match each other.