fix: Update flaky knowledge test (#5548)

## Summary

Describe key changes, mention related issues or motivation for the
changes.

(If applicable, issue number: #\_\_\_\_)

## Type of change

- [ ] Bug fix
- [ ] New feature
- [ ] Breaking change
- [ ] Improvement
- [ ] Model update
- [ ] Other:

---

## Checklist

- [ ] Code complies with style guidelines
- [ ] Ran format/validation scripts (`./scripts/format.sh` and
`./scripts/validate.sh`)
- [ ] Self-review completed
- [ ] Documentation updated (comments, docstrings)
- [ ] Examples and guides: Relevant cookbook examples have been included
or updated (if applicable)
- [ ] Tested in clean environment
- [ ] Tests added/updated (if applicable)

---

## Additional Notes

Add any important context (deployment instructions, screenshots,
security considerations, etc.)

libs/agno/tests/integration/knowledge/test_pdf_knowledge.py

@@ -395,6 +395,7 @@ def test_pdf_url_knowledge_base_with_metadata_path_invalid_filter(setup_vector_d
         "please clarify",
         "need more information",
         "be more specific",
+        "specific",
     ]
 
     recipes_mentioned = any(cuisine in response_content for cuisine in ["thai", "cape", "tom kha", "cape malay"])
@@ -493,6 +494,7 @@ async def test_async_pdf_url_knowledge_base_with_metadata_path_invalid_filter(se
         "please clarify",
         "need more information",
         "be more specific",
+        "specific",
     ]
 
     recipes_mentioned = any(cuisine in response_content for cuisine in ["thai", "cape", "tom kha", "cape malay"])