frequency uses NonEmptyList, oneOf uses NonEmptyArray

[drathier]

It's a real road-bump that these two don't accept the same type. Switching from oneOf to frequency shouldn't require me to add a new import and use a different list type.

https://github.com/purescript/purescript-quickcheck/blob/v7.1.0/src/Test/QuickCheck/Gen.purs#L158-L166

[JordanMartinez]

I'm adding this as a breaking change.