Use Win11 runner for system tests

Author: t1m0thyj

.github/workflows/build.yml

@@ -57,7 +57,7 @@ jobs:
         path: uwp\AppPackages\*\*.msix
 
   test:
-    runs-on: windows-latest
+    runs-on: windows-2025
     if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
     needs: build