Many unit tests fails on macOS

I installed a macosx CI in !19 (merged) and logs of failing tests can be seen here: https://xclaesse.pages.gitlab.gnome.org/-/glib/-/jobs/37050/artifacts/_build/meson-logs/testlog.txt

Tests which need fixing:

• gio/appmonitor
• gio/contenttype (tracked separately as #1251 (closed)): !4390 (merged)
• gio/giomodule: !2950 (merged)
• gio/gsubprocess: !2785 (merged)
• gio/g-file-info: !2990 (merged) / !3004 (merged)
• gio/network-address: !2520 (merged) / !2538 (merged)
• gio/socket
• gio/gdbus-address-get-session !3032 (closed)
• gio/gdbus-peer (partly fixed by !3032 (closed))
• gio/resources: !2950 (merged)
• glib/date
• glib/environment