GitHub Actions: Updates to the virtual environments

We’ve fully deployed several updates to the GitHub Actions virtual environments. Highlights include:

• • Upgraded to Visual Studio 16.4.0 (Windows Server 2019)
  • Upgraded to Firefox 71.0 (Ubuntu 18.04, Windows Server 2016, and Windows Server 2019)

You can find more information in the docs. Please note that we plan to pause updates until January 2020.