Drop unused dependencies

Both KF6Crash and KF6IconThemes aren't used anymore after porting to
KirigamiApp in eab45e761a.

.kde-ci.yml

@@ -14,7 +14,6 @@ Dependencies:
       'frameworks/kquickcharts': '@latest-kf6'
       'frameworks/knotifications': '@latest-kf6'
       'frameworks/kcolorscheme': '@latest-kf6'
-      'frameworks/kiconthemes': '@latest-kf6'
       'libraries/kquickimageeditor': '@latest-kf6'
       'frameworks/sonnet': '@latest-kf6'
       'frameworks/prison': '@latest-kf6'
@@ -29,7 +28,6 @@ Dependencies:
       'frameworks/kio': '@latest-kf6'
       'frameworks/kwindowsystem': '@latest-kf6'
       'frameworks/kstatusnotifieritem': '@latest-kf6'
-      'frameworks/kcrash': '@latest-kf6'
   - 'on': ['Linux', 'FreeBSD']
     'require':
       'frameworks/kdbusaddons': '@latest-kf6'