Fix Chocolately build

[Daniel15]

https://build.dan.cx/job/yarn-chocolatey/54/console

WARNING: The specified PackageManagement provider 'NuGet' is not available.
Find-Package : No match was found for the specified search criteria and package name 'Yarn'. Try Get-PackageSource to 
see all available registered package sources.
At C:\Jenkins\workspace\yarn-chocolatey\scripts\build-chocolatey.ps1:28 char:31
+ $latest_chocolatey_version = (Find-Package -Name Yarn).Version
+                               ~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Microsoft.Power...ets.FindPackage:FindPackage) [Find-Package], Exceptio 
   n
    + FullyQualifiedErrorId : NoMatchFoundForCriteria,Microsoft.PowerShell.PackageManagement.Cmdlets.FindPackage

Although, the NuGet PackageManagement provider is available on this server.

Maybe we should just remove its usage from the script, and just use the choco command.