Update dependencies from https://github.com/dotnet/arcade build 20210131.1 (#9590)

[master] Update dependencies from dotnet/arcade
- Coherency Updates:
  - XliffTasks: from 1.0.0-beta.21076.1 to 1.0.0-beta.21080.1 (parent: Microsoft.DotNet.Arcade.Sdk)

eng/common/internal-feed-operations.ps1

@@ -63,8 +63,6 @@ function SetupCredProvider {
   }
 
   if (($endpoints | Measure-Object).Count -gt 0) {
-      # [SuppressMessage("Microsoft.Security", "CS002:SecretInNextLine", Justification="Endpoint code example with no real credentials.")]
-      # Create the JSON object. It should look like '{"endpointCredentials": [{"endpoint":"http://example.index.json", "username":"optional", "password":"accesstoken"}]}'
       $endpointCredentials = @{endpointCredentials=$endpoints} | ConvertTo-Json -Compress
 
      # Create the environment variables the AzDo way