style: format test file with ruff

Author: vishal-vanam

tests/shared/test_streamable_http.py

@@ -2336,4 +2336,3 @@ def return_plain_text(request: httpx.Request) -> httpx.Response:
         async with ClientSession(read_stream, write_stream) as session:
             with pytest.raises(MCPError, match="Unexpected content type"):
                 await session.initialize()
-