Support NumPy 1.24 features. I've extracted items related to CuPy from the Release Notes:

• New attribute symbol added to polynomial classes
• strict option for testing.assert_array_equal
• New parameter equal_nan added to np.unique
• casting and dtype keyword arguments for numpy.stack
• casting and dtype keyword arguments for numpy.vstack
• casting and dtype keyword arguments for numpy.hstack
• The bit generator underlying the singleton RandomState can be changed
• numpy.typing protocols are now runtime checkable

Split from #7243.