Fix build to use the new docsrs flag instead of the dox feature
This also updates the gir file to 3.4.2 and run gir-files/reformat.sh on it, otherwise the gir tool errors out. Then files are regenerated.
This also updates the gir file to 3.4.2 and run gir-files/reformat.sh on it, otherwise the gir tool errors out. Then files are regenerated.