Chore(test): remove deprecated algorithm

[angela-tran]

Our pytest check has been failing (e.g. the one for #205)

@thekaveman found python/cpython#91257, which says:

The hashlib.algorithms_available set includes algorithms like ripemd160 and whirlpool, those algorithms are not usable unless openssl legacy provider is loaded. Since it's not loaded, and the hashlib module won't load it, any attempt to use them fails.

We'll remove whirlpool from our test cases.

[thekaveman]

See python/cpython#91257

We aren't using this algorithm in production and so OK to remove from the tests.