Update posthog/ai/otel/exporter.py

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

Author: andrewm4894

posthog/ai/otel/exporter.py

@@ -449,7 +449,7 @@ def _create_tool_span_event(
             "$ai_span_name": tool_name,
             "$ai_latency": latency,
             "$ai_is_error": is_error,
-            "$ai_framework": "pydantic-ai",
+            "$ai_framework": "opentelemetry",
             **self._properties,
         }