Switch back to windows-2019 on CI (#3854)

Looks like windows-2022 is failing, let's perhaps pin for now?

.github/workflows/main.yml

@@ -215,8 +215,8 @@ jobs:
         include:
           - os: ubuntu-latest
           - os: macos-latest
-          - os: windows-latest
-          - os: windows-latest
+          - os: windows-2019
+          - os: windows-2019
             target: x86_64-pc-windows-gnu
           - os: ubuntu-latest
             target: aarch64-unknown-linux-gnu