x11/nwg-dock: update to 0.4.3

Changes: https://github.com/nwg-piotr/nwg-dock/releases/tag/v0.4.2
Changes: https://github.com/nwg-piotr/nwg-dock/releases/tag/v0.4.3
Reported by: GitHub (watch releases)

(cherry picked from commit 34a780ebc1988f3a476441e048291c1cb02fc42f)