Github Actions builds fails do to missing mklink

The Github Actions configuration uses mklink to put sbt on the path. Recently, this broke with the following message:

mklink : The term 'mklink' is not recognized as the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At D:\a_temp\79a997b0-f0ad-4763-9266-2c7c5be91bd6.ps1:7 char:1
+ mklink "C:\ProgramData\Chocolatey\bin\sbt" "C:\Program Files (x86)\sb ...

Need to determine why this no longer works and fix to get windows tests working again.