fix(test): update reasoning_effort test to expect dict format

Update test expectations to match the current code behavior where
reasoning_effort is transformed from a string to a dict with
'effort' and 'summary' fields.

The transformation happens in:
litellm/llms/anthropic/experimental_pass_through/adapters/handler.py:72-74

When reasoning_effort is a string like "minimal", it's converted to:
{"effort": "minimal", "summary": "detailed"}

The test was expecting just the string "minimal", causing it to fail.

Test now passes ✅

Related: test was failing on PR #21217, but NOT caused by PR #21217
(which only modifies test_anthropic_structured_output.py). This is a
pre-existing broken test that also fails on main branch.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/test_litellm/llms/anthropic/experimental_pass_through/messages/test_anthropic_experimental_pass_through_messages_handler.py

@@ -176,8 +176,12 @@ def test_openai_model_with_thinking_converts_to_reasoning_effort():
         
         # Verify reasoning_effort is set (converted from thinking)
         assert "reasoning_effort" in call_kwargs, "reasoning_effort should be passed to completion"
-        assert call_kwargs["reasoning_effort"] == "minimal", f"reasoning_effort should be 'minimal' for budget_tokens=1024, got {call_kwargs.get('reasoning_effort')}"
-        
+
+        # reasoning_effort is transformed into a dict with effort and summary fields
+        expected_reasoning_effort = {"effort": "minimal", "summary": "detailed"}
+        assert call_kwargs["reasoning_effort"] == expected_reasoning_effort, \
+            f"reasoning_effort should be {expected_reasoning_effort} for budget_tokens=1024, got {call_kwargs.get('reasoning_effort')}"
+
         # Verify thinking is NOT passed (non-Claude model)
         assert "thinking" not in call_kwargs, "thinking should NOT be passed for non-Claude models"