fix: change ci runner to address visual sdk issue (#752)

Author: louis-menlo

.github/workflows/cortex-build.yml

@@ -276,7 +276,7 @@ jobs:
 
           - os: "windows"
             name: "amd64"
-            runs-on: "windows-latest"
+            runs-on: "windows-2019"
 
           - os: "mac"
             name: "amd64"