KDE: Update KDE Frameworks 6 to 6.21.0
Announcement: https://kde.org/announcements/frameworks/6/6.21.0/
Ports changes:
devel/kf6-extra-cmake-modules:
- Fix FindInotify.cmake module
- Remove stale patch
x11-toolkits/kf6-kirigami:
- Backport upstream patch
PR: 291637
Exp-run by: antoine