Update multitarget options in build workflow to limit platforms

Author: Arlodotexe

.github/workflows/build.yml

@@ -145,7 +145,7 @@ jobs:
       fail-fast: false # prevent one matrix pipeline from being cancelled if one fails, we want them all to run to completion.
       matrix:
         winui: [2, 3]
-        multitarget: ['uwp', 'wasdk', 'wasm', 'wpf', 'linuxgtk', 'macos', 'ios', 'android']
+        multitarget: ['uwp', 'wasdk', 'wasm']
         exclude:
           # WinUI 2 not supported on wasdk
           - winui: 2