fix testing

Author: rusty1s

.github/workflows/testing.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-latest, windows-2019]
         python-version: [3.7]
         torch-version: [1.10.0, 1.11.0]