Spectacle is switching to the Plasma release schedule

[Noah Davis]

Spectacle will have a KDE Gear 24.12 release from 24.12.0 to 24.12.3
like normal, but it will also have a 6.3 release in sync with Plasma.
The 24.12 and 6.3 releases will be maintained at the same time until
24.12.3. The releases after 6.3 will be 6.4, 6.5 and so on just like
Plasma. Spectacle needed to switch because its core functionality
depends on KWin and KPipeWire.