EvalML unit tests error out after Woodwork numpy upgrade

[christopherbunn]

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Per this Woodwork/EvalML main job run, it looks like we are raising errors related to inconsistent dtypes. Given the timing, it might be related to numpy being bumped up in Woodwork but that has not been checked out.

Last EvalML release hash: https://github.com/alteryx/evalml/commit/e93f513b11e648616326674f1fef5c63a1ad6db4 Last Woodwork release hash: https://github.com/alteryx/woodwork/commit/178cdbfa6019db795dacabef54acccc36aba8ba6