[test] Use windows-2019 for tests

(At least for now) resolves #31249

.github/workflows/ci.yml

@@ -15,12 +15,12 @@ jobs:
         run-tests-ext: [sh]
         include:
         # python 3.2 is only available on windows via setup-python
-        - os: windows-latest
+        - os: windows-2019
           python-version: 3.2
           python-impl: cpython
           ytdl-test-set: core
           run-tests-ext: bat
-        - os: windows-latest
+        - os: windows-2019
           python-version: 3.2
           python-impl: cpython
           ytdl-test-set: download