gio/tests: Add test generated txt as the resources test dependency
This is required by the resources used in some tests, however we did not depend on it so we had some random build failures: https://gitlab.gnome.org/3v1n0/glib/-/jobs/3253787
This is required by the resources used in some tests, however we did not depend on it so we had some random build failures: https://gitlab.gnome.org/3v1n0/glib/-/jobs/3253787