Misc/NEWS.d/next/Tests/2022-06-08-14-17-59.gh-issue-93575.Xb2LNB.rst

Fix issue with test_unicode test_raiseMemError. The test case now use
``test.support.calcobjsize`` to calculate size of PyUnicode structs.
:func:`sys.getsizeof` may return different size when string has UTF-8
memory.