Add Python 3.9-3.10 compatibility for PEP 678 exception notes

Add hasattr(e, 'add_note') checks before calling add_note() to ensure
compatibility with Python 3.9 and 3.10 where PEP 678 exception notes
are not available. The enhanced HTTP status context will only be added
in Python 3.11+ while maintaining backward compatibility.

Author: adev-code

botocore/parsers.py

@@ -598,7 +598,7 @@ def _do_error_parse(self, response, shape):
             status_message = http.client.responses.get(
                 response['status_code'], ''
             )
-            if status_message:
+            if status_message and hasattr(e, 'add_note'):
                 e.add_note(f"HTTP {response['status_code']}: {status_message}")
             raise
         parsed = self._build_name_to_xml_node(root)
@@ -1461,7 +1461,7 @@ def _parse_error_from_body(self, response):
             status_message = http.client.responses.get(
                 response['status_code'], ''
             )
-            if status_message:
+            if status_message and hasattr(e, 'add_note'):
                 e.add_note(f"HTTP {response['status_code']}: {status_message}")
             raise
         parsed = self._build_name_to_xml_node(root)