C#: Also run extractor unit tests on a windows runner.

Author: michaelnebel

.github/workflows/csharp-qltest.yml

@@ -65,7 +65,10 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ github.token }}
   unit-tests:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-2019]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
       - name: Setup dotnet