Update dotnet-install.ps1 script for new CDN urls

[rhysparry]

Background

The .NET install links recently changed. We maintain a modified copy of the dotnet-install.ps1 script in this repository to ensure TLS 1.2 is used when the script is run on older operating systems.

This change applies these changes to the current latest script.

Results

Script updated to reflect the upstream changes. Note: the upstream version includes the new domains, but still has some references to the old domains (dotnetcli.azureedge.net and dotnetbuilds.azureedge.net). There is an upstream issue tracking this: dotnet/install-scripts#559

How to review this PR

Quality ✔️

Pre-requisites

• I have read How we use GitHub Issues for help deciding when and where it's appropriate to make an issue.
• I have considered informing or consulting the right people, according to the ownership map.
• I have considered appropriate testing for my change.

[rhysparry]

Is there an easy way to see the differences between the original script form the dotnet repo, and our modified version?

If you check out the branch locally you can run the following to compare this version with the currently published upstream.

diff --color=auto --strip-trailing-cr <(curl --location https://dot.net/v1/dotnet-install.ps1) dotnet-install.ps1

[gb-8]

Maybe considered out-of-scope, but the way we are enabling TLS 1.2 forces the disabling of TLS 1.3.

I think it would be better to bitwise AND with TLS 1.2 instead of straight assignment.

[gb-8]

Approved, but with same question about not disabling TLS 1.3 as on the Halibut PR.