Update request_handler.py

Solved utcfromtimestamp deprecation by using timezone-aware objects to represent datetimes.

(datetime.datetime.fromtimestamp(timestamp, datetime.UTC)  

Reference: python/cpython#106392

Author: Neecrownsmith

PyTweetToolkit/utils/request_handler.py

@@ -1,5 +1,5 @@
 import requests
-from datetime import datetime
+import datetime
 import time
 
 
@@ -100,8 +100,8 @@ def _handle_response(self, response: requests.Response) -> requests.Response:
                 # Handle rate limiting
                 reset_time = response.headers.get('x-rate-limit-reset')
                 if reset_time:
-                    reset_time = datetime.utcfromtimestamp(int(reset_time))
-                    current_time = datetime.utcfromtimestamp(time.time())
+                    reset_time = datetime.datetime.fromtimestamp(int(reset_time), datetime.UTC) 
+                    current_time = datetime.datetime.fromtimestamp(time.time())
                     wait_seconds = (reset_time - current_time).total_seconds() + 1
                     raise RuntimeError(f"429 Too Many Requests | Rate limit exceeded. Retry after {wait_seconds} seconds | Message: {error_msg}".strip())
                 else: