fix: add type ignore to builtins ExceptionGroup import

- CI pyright version updated and now reports ExceptionGroup as unknown import
- Add type ignore comment to both import paths for compatibility
- Resolves CI type checking errors

Author: Wyn1996

tests/shared/test_streamable_http.py

@@ -12,7 +12,7 @@
 from typing import Any
 
 try:
-    from builtins import ExceptionGroup
+    from builtins import ExceptionGroup  # type: ignore
 except ImportError:
     from exceptiongroup import ExceptionGroup  # type: ignore