BUG: use hash-function which takes nans correctly into account for ExtensionDtype #42135
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pandas/tests/arrays/sparse/test_dtype.py test_hash_equal
fails on Python3.10 (see #41940). This is due to the fact, that since Python3.10 different nan-objects have different hashes.In #41988 a hash function with the old pre-Python3.10 behavior was introduced. This function is used in ExtensionDtype to keep the correct behavior also with Python3.10.