AzureFeed 'dotnetcli.azureedge.net/dotnet' in dotnet-install script was too slow in China

As dotnet/install-scripts#236 , I tried to install sdk with version 5.0.404, it was slow too. So I guss, it is not about `latest.version`.

Here are the cmds:

```
./dotnet-install.sh --version 5.0.404
./dotnet-install.sh --version 6.0.100
```

The script showed their download urls(sdk v5.0 and v6.0):

```
https://dotnetcli.azureedge.net/dotnet/Sdk/5.0.404/dotnet-sdk-5.0.404-linux-musl-x64.tar.gz
https://dotnetcli.azureedge.net/dotnet/Sdk/6.0.100/dotnet-sdk-6.0.100-linux-musl-x64.tar.gz
```

Here is my speed in browser:


For current situation, it is always blocked and finally failed when I use the scripts in linux server in China.

Would you like please to check agin and resolve it, THX!