https://dot.net now using TLS 1.2-only

[leecow]

Earlier today, https://dot.net switched to using TLS 1.2-only. Most Windows Powershell instances default to TLS 1.1 and will thus fail with wget : The underlying connection was closed: An unexpected error occurred on a send. trying to run the previous command.

An example of a PowerShell script fix can be seen in dotnet/docs#6689