Remove text that older mypy versions don't support (#1287)

Author: metanivek

logfire/_internal/utils.py

@@ -179,7 +179,7 @@ def span_to_dict(span: ReadableSpan) -> ReadableSpanDict:
 class UnexpectedResponse(RequestException):
     """An unexpected response was received from the server."""
 
-    response: Response  # type: ignore (guaranteed to exist)
+    response: Response  # type: ignore
 
     def __init__(self, response: Response) -> None:
         super().__init__(f'Unexpected response: {response.status_code}', response=response)