net-im/gajim: update to 2.0.1

• update to 2.0.1
• switch to gtk4
• chase spelling library change
• remove commented gupnp dependency - it's implemented via gobject anyway, but still disabled in gajim's source

Release notes:
https://gajim.org/post/2025-02-28-gajim-2.0.0-released/
https://gajim.org/post/2025-03-03-gajim-2.0.1-released/