package/libglib2: bump version to 2.84.0
Upstream changelog:
https://gitlab.gnome.org/GNOME/glib/-/blob/main/NEWS?ref_type=heads
Note that upstream is planning to require C11 starting with 2.85.x,
and encourages people who would have problems with that to file
issues: https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4473
Signed-off-by: Fiona Klute (WIWA) <fiona.klute@gmx.de>
Signed-off-by: Julien Olivain <ju.o@free.fr>