feat(perplexity-ai): update model YAMLs [bot] (#918)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: harshiv-26

providers/perplexity-ai/sonar-pro.yaml

@@ -4,6 +4,7 @@ costs:
       region: "*"
 features:
     - structured_output
+    - system_messages
 limits:
     context_window: 200000
 modalities: