Update-dependencies with an arcade update can sometimes take an excessive time

[mmitche]

If update-dependencies is run with an arcade BAR build ID, it appears that the process takes an excessive amount of time gathering up the arcade files, at least if they are being obtained from AzDO. It hink most of this time is spent in:

public async Task<string> GetTokenForAccountAsync(string account)
{
    var credential = GetCredential(account);
    return (await credential.GetTokenAsync(new TokenRequestContext([AzureDevOpsScope]), cancellationToken: default)).Token;
}