Fix serialization to use str() instead of repr() for better custom object output

- Change to_serializable() to use str(obj) instead of repr(obj) for unknown objects
- This provides more meaningful serialization output for custom objects with __str__ methods
- Regenerate VCR cassette for DataFrame test to include complete API interactions
- Fixes test_interpolate_custom_object_validation expecting '5' in serialized output

Co-Authored-By: João <joao@crewai.com>

src/crewai/utilities/serialization.py

@@ -68,7 +68,7 @@ def to_serializable(
             _current_depth=_current_depth + 1,
         )
     else:
-        return repr(obj)
+        return str(obj)
 
 
 def _to_serializable_key(key: Any) -> str:

tests/cassettes/test_crew_kickoff_with_pandas_dataframe.yaml

@@ -48,7 +48,7 @@ interactions:
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       Date:
-      - Sat, 31 May 2025 19:53:39 GMT
+      - Sat, 31 May 2025 20:07:51 GMT
       Permissions-Policy:
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@@ -66,9 +66,9 @@ interactions:
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@@ -167,8 +167,10 @@ interactions:
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@@ -176,27 +178,25 @@ interactions:
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