Add alias for dotnet workload update command

[augustoproiete]

dotnet workload update - Updates installed workloads. Introduced with .NET 6 SDK.

The dotnet workload update command updates all installed workloads to the newest available versions. It queries Nuget.org for updated workload manifests. It then updates local manifests, downloads new versions of the installed workloads, and removes all old versions of each workload.

Docs: https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-workload-update

[gep13]

@Marusyk done, thank you for your help with all these changes!

[cake-build-bot]

🎉 This issue has been resolved in version v2.3.0 🎉

The release is available on:

• GitHub Release
• .NET Tool

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