[dns] require running event loop
[dns] require running event loop

Co-authored-by: Maximilian Hils <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@maximilianhils.com>
mitmproxy/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,mhils/mitmproxy,mhils/mitmproxy,mitmproxy/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy