Update dependency enzyme-adapter-react-16 to v1.15.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
enzyme-adapter-react-16 (source)	1.15.5 -> 1.15.6

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Release Notes

enzymejs/enzyme

### [`v1.15.6`](https://togithub.com/enzymejs/enzyme/compare/enzyme-adapter-react-16@​1.15.5...enzyme-adapter-react-16@​1.15.6) [Compare Source](https://togithub.com/enzymejs/enzyme/compare/enzyme-adapter-react-16@​1.15.5...enzyme-adapter-react-16@​1.15.6)

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