more minor fixes

Author: ezhang6811

instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/bedrock.py

@@ -361,7 +361,6 @@ def _set_if_not_none(attributes, key, value):
 
     def _get_request_messages(self):
         """Extracts and normalize system and user / assistant messages"""
-        input_text = None
         if system := self._call_context.params.get("system", []):
             system_messages = [{"role": "system", "content": system}]
         else:
@@ -397,6 +396,7 @@ def _get_request_messages(self):
 
         return system_messages + messages
 
+    # pylint: disable=no-self-use
     def _get_messages_from_input_text(
         self, decoded_body: dict[str, Any], input_name: str
     ):