`socket` module should use `PyMutex` instead of Lock

[KowalskiThomas]

Issue

This is a follow-up from #150406 where @kumaraditya303 pointed out that the existing Lock allocated here...

cpython/Modules/socketmodule.c

Lines 9294 to 9296 in a189e3d

	#if defined(USE_GETHOSTBYNAME_LOCK)
	netdb_lock = PyThread_allocate_lock();
	#endif

... should be replaced with a PyMutex.

Linked PRs

• gh-150452: use PyMutex in socket module #150453