dotnet azure cdn urls are changing

[viceice]

• Critical: .NET install domains and URLs are changing dotnet/core#9671

we need to update very soon.

base/src/cli/tools/dotnet.ts

Line 121 in 6a63cbe

const url = `https://dotnetcli.azureedge.net/dotnet/Sdk/${version}/dotnet-sdk-${version}-linux-${this.arch}.tar.gz`;