user/[KDE Plasma]: Bump to 5.18.0 release

user/breeze-gtk/APKBUILD

user/breeze/APKBUILD

user/kactivitymanagerd/APKBUILD

user/kde-cli-tools/APKBUILD

user/kde-gtk-config/APKBUILD

user/kdecoration/APKBUILD

user/kdeplasma-addons/APKBUILD

user/kgamma5/APKBUILD

user/khotkeys/APKBUILD

user/kinfocenter/APKBUILD

user/kmenuedit/APKBUILD

user/kscreenlocker/APKBUILD

user/ksshaskpass/APKBUILD

user/ksysguard/APKBUILD

user/kwin/APKBUILD

user/libkscreen/APKBUILD

user/libksysguard/APKBUILD

user/libkworkspace/APKBUILD

user/libkworkspace/standalone.patch

user/milou/APKBUILD