fix(deps): update dependency prop-types to v15.7.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
prop-types (source)	dependencies	minor	15.5.10 -> 15.7.2

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Release Notes

facebook/prop-types

v15.7.2

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• [Fix] ensure nullish values in oneOf do not crash (#​256)
• [Fix] move loose-envify back to production deps, for browerify usage (#​203)

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• Fix an issue where outdated BSD license headers were still present in the published bundle #​162

v15.6.0

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• Switch from BSD + Patents to MIT license
• Add PropTypes.exact, like PropTypes.shape but warns on extra object keys. (@​thejameskyle and @​aweary in #​41 and #​87)

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