Post-release version bump to 3.7.3
Post-release version bump to 3.7.3

davibe/pygobject,sfeltman/pygobject,GNOME/pygobject,GNOME/pygobject,GNOME/pygobject,pexip/pygobject,sfeltman/pygobject,pexip/pygobject,pexip/pygobject,davibe/pygobject,sfeltman/pygobject,davibe/pygobject,davibe/pygobject