[issue31420] Reference leaks introduced by bpo-30860

[STINNER Victor]

STINNER Victor added the comment:

Extract of my msg295399: "The problem is that warnoptions is stored in a C global variable *and* in sys.warnoptions of each interpreter. The ownership of this variable is unclear."

Maybe we need a change similar to bpo-28411 (commit 86b7afdfeee77993fe896a2aa13b3f4f95973f16) which removed the "modules" field from Py_InterpreterState.

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