chore: finalize LiteLLM anthropic rebase resolution

Author: giulio-leone

src/google/adk/models/lite_llm.py

@@ -428,9 +428,9 @@ def _convert_reasoning_value_to_parts(reasoning_value: Any) -> List[types.Part]:
             signature = block.get("signature")
             if signature:
               decoded_signature = _decode_thought_signature(signature)
-              part.thought_signature = (
-                  decoded_signature or str(signature).encode("utf-8")
-              )
+              part.thought_signature = decoded_signature or str(
+                  signature
+              ).encode("utf-8")
             parts.append(part)
           continue
       # Fall back to text extraction for non-thinking-block items.

tests/unittests/models/test_litellm.py

@@ -4836,13 +4836,11 @@ async def test_content_to_message_param_anthropic_outputs_thinking_blocks():
       content, model="anthropic/claude-4-sonnet"
   )
   assert result["role"] == "assistant"
-  assert result["thinking_blocks"] == [
-      {
-          "type": "thinking",
-          "thinking": "deep thought",
-          "signature": "sig_round_trip",
-      }
-  ]
+  assert result["thinking_blocks"] == [{
+      "type": "thinking",
+      "thinking": "deep thought",
+      "signature": "sig_round_trip",
+  }]
   assert result.get("reasoning_content") is None
   assert result["content"] == "Hello!"