[issue43916] Mark static types newly converted to heap types as immutable: add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> bpo-43916: _md5.md5 uses Py_TPFLAGS_DISALLOW_INSTANTIATION (GH-25753)

With this change, all tests listed in this issue should be fixed.

But I didn't check the whole list of https://discuss.python.org/t/list-of-built-in-types-converted-to-heap-types/8403

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