[bug#42923] [core-updates]: Add meson/latest and update wayland/sway.

[Brendan Tildesley]

I wanted to update sway but it requires a an update to wayland and 
meson, which rebuilds thousands of things. I'm not sure the full process 
for updating something like meson and wayland but I wanted to get the 
ball rolling so I made these patches that add meson/latest and update 
sway applied to the core-updates branch. I had tested them on master and 
and was able to launch sway 1.5 just fine.