Update WebKitGTK bindings metadata from vala 0.42.5

Fixes vapigen error with that version.
7 jobs for wip/strict-async-out-param-0.12 in 9 minutes and 37 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #207153
debian

00:07:45

passed #207155
deb-package

00:08:07

passed #207152
fedora

00:08:10

failed #207158
flatpak-package

00:04:08

passed #207157
ubuntu

00:06:19

failed #207156
flatpak-package

00:02:41

failed #207154
ubuntu

00:00:13

 
Name Stage Failure
failed
flatpak-package Build
Using Docker executor with image registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:3.28 ...
Pulling docker image registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:3.28 ...
Using docker image sha256:5c7afa8334e663173b55bc9f253e415ded1584c53a2f9c8d43f880473e4c9261 for registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:3.28 ...
Running on runner-f23948e6-project-1894-concurrent-0 via progress.gnome.org...
Cloning repository...
Cloning into '/builds/GNOME/geary'...
fatal: unable to access 'https://gitlab-ci-token:xxxxxxxxxxxxxxxxxxxx@gitlab.gnome.org/GNOME/geary.git/': Could not resolve host: gitlab.gnome.org
/bin/bash: line 82: cd: /builds/GNOME/geary: No such file or directory
ERROR: Job failed: exit code 1