style: wrap long function signature to pass ruff-format

Pre-commit ruff-format check failed because the return type annotation
for get_headers() in the test exceeded line-length limits. Wrap it to
three lines to satisfy the formatter.

Author: anneheartrecord

tests/server/mcpserver/test_func_metadata.py

@@ -261,7 +261,9 @@ def get_config() -> Annotated[dict[str, int], Field(description="Configuration v
     )
 
     # Additional metadata (title, max_length, etc.) should also be preserved
-    def get_headers() -> Annotated[dict[str, str], Field(description="HTTP headers", title="Headers")]:  # pragma: no cover
+    def get_headers() -> Annotated[
+        dict[str, str], Field(description="HTTP headers", title="Headers")
+    ]:  # pragma: no cover
         return {"Content-Type": "application/json"}
 
     meta2 = func_metadata(get_headers)