test: Follow the new behavior of typing.get_type_hints() since py311 #10232
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Since python-3.11, `typing.get_type_hints()` will not add Optional[t] to type annotations even if a default value for function argument is None. refs: python/cpython#30304 (bpo-46195)
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Feature or Bugfix
Purpose
typing.get_type_hints()will not add Optional[t] totype annotations even if a default value for function argument is None.
Optionalinget_type_hintspython/cpython#30304 (bpo-46195)