KDE: Update Plasma to 6.4.3
Announcements: https://kde.org/announcements/plasma/6/6.4.3/
Ports changes:
- Explicitly disable KF6NetworkManagerQt, it is a stub currently.
audio/plasma6-plasma-pa:
- Renew USE_KDE components
(cherry picked from commit f235dbcc7b076eee73338aaa00e11ccfbf20a60b)