Fix default socket timeout #4095
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PR #3854 accidentally set the default timeout of the Socket module to 0, which does not match Cpython's default of None (as in, never time out). This was causing some user programs to throw unexpected EAGAIN errors. Additionally, when Socket was placed in non-blocking mode (with a timeout of 0), even successful calls from some functions would result in ETIMEDOUT. This PR fixes both issues.