Update dependency prop-types to v15.7.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
prop-types	devDependencies	minor	15.6.0 -> 15.7.1	homepage, source

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Release Notes

facebook/prop-types

v15.7.1

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• [Fix] avoid template literal syntax (#​255, #​254)

v15.6.2

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• Remove the fbjs dependency by inlining some helpers from it (#​194))

v15.6.1

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• Fix an issue where outdated BSD license headers were still present in the published bundle #​162

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