Remove unused imports of requests

This was the objective, really.

Contributes to issue CURA-8539.

cura/OAuth2/AuthorizationHelpers.py

@@ -8,7 +8,6 @@ from PyQt5.QtNetwork import QNetworkReply
 import secrets
 from threading import Lock
 from typing import Callable, Optional
-import requests
 import urllib.parse
 
 from UM.i18n import i18nCatalog

cura/OAuth2/AuthorizationService.py

@@ -6,7 +6,6 @@ from datetime import datetime, timedelta
 from typing import Callable, Dict, Optional, TYPE_CHECKING
 from urllib.parse import urlencode, quote_plus
 
-import requests.exceptions
 from PyQt5.QtCore import QUrl
 from PyQt5.QtGui import QDesktopServices