glib-networking: upgrade 2.72.0 -> 2.72.1

2.72.1 - June 29, 2022
======================

 - Discard empty proxy environment variables (#189)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 49827652)
Signed-off-by: Steve Sakoman <steve@sakoman.com>