set windows version to latest on ci

Author: ntsoftware

.github/workflows/windows.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2019]
+        os: [windows-latest]
         env:
         - TARGET: x86_64-pc-windows-msvc
         - TARGET: i686-pc-windows-msvc