x11-wm/sway: update to 1.0.b.2.189

The last beta is several months old, so use a snapshot to help users
evaluate the current state.

Changes: https://github.com/swaywm/sway/compare/1.0-beta.2...2573606b
Changes: https://github.com/swaywm/wlroots/compare/0.2...10a2c4ed