x11/plasma5-plasma: Update KDE Plasma Desktop to 5.22.3

Tuesday, 6 July 2021. Today KDE releases a bugfix update to KDE Plasma
5, versioned 5.22.3.

Plasma 5.22 was released in June 2021 with many feature refinements and
new modules to complete the desktop experience.

This release adds two weeks' worth of new translations and fixes from
KDE's contributors. The bugfixes are typically small but important and
include:

• Dr Konqi: Repair query construction.
• Plasma Disks: Don’t notify on instabilities.
• [Task Manager] Load album art background asynchronously.

Full Changelog:
https://kde.org/announcements/changelogs/plasma/5/5.22.2-5.22.3/