meson: use latest stable version of libadwaita
This unlocks gnome-build-meta's CI that's failing currently with the following:
Dependency libadwaita-1 found: NO found 1.0.0 but need: '>=1.0.0.alpha.3'
Edited by Javier Jardón
This unlocks gnome-build-meta's CI that's failing currently with the following:
Dependency libadwaita-1 found: NO found 1.0.0 but need: '>=1.0.0.alpha.3'