SerpAPI requests can hang indefinitely without timeout

The SerpAPI wrapper in desearch/tools/search/serp_api_wrapper.py makes HTTP requests without any timeout. If SerpAPI is slow or unresponsive, requests hang forever.

This affects the validator and miner web search functionality. A single hanging request can block the entire process.

Fix is ready in PR #310: https://github.com/Desearch-ai/subnet-22-desearch/pull/310