ci: pin Windows platform to 2019

windows-latest now has VS2022 which isn't supported by node yet

Author: mscdex

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Run tests
         run: npm test
   tests-windows:
-    runs-on: windows-latest
+    runs-on: windows-2019
     strategy:
       fail-fast: false
       matrix: