fix: remove unused require

Signed-off-by: Tierney Cyren <[email protected]>

Author: bnb

src/commands/token/flex.js

@@ -1,5 +1,4 @@
 const { TwilioClientCommand } = require('@twilio/cli-core').baseCommands;
-const { TwilioCliError } = require('@twilio/cli-core').services.error;
 const Twilio = require('twilio');
 const createToken = require('../../helpers/accessToken.js');
 const globalFlags = require('../../helpers/globalFlags.js');