Change windows-2019 runner to windows-latest.

Author: jonsimantov

.github/workflows/build_windows.yml

@@ -40,7 +40,7 @@ permissions: write-all
 jobs:
   build_desktop:
     name: build-windows-unity${{inputs.unity_version}}-CPP${{ inputs.firebase_cpp_sdk_version }}
-    runs-on: windows-2019
+    runs-on: windows-latest
     strategy:
       fail-fast: false