Bump prop-types from 15.6.1 to 15.7.1 in /frontend

[dependabot-preview]

Bumps prop-types from 15.6.1 to 15.7.1.

Changelog

Sourced from prop-types's changelog.

15.7.1

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

15.7.0

• [New] Add .elementType (#211)
• [New] add PropTypes.resetWarningCache (#178)
• oneOf: improve warning when multiple arguments are supplied (#244)
• Fix oneOf when used with Symbols (#224)
• Avoid relying on hasOwnProperty being present on values' prototypes (#112, #187)
• Improve readme (#248, #233)
• Clean up mistaken runtime dep, swap envify for loose-envify (#204)

15.6.2

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

Commits

• 48eb8fa v15.7.1
• 672ff96 [Fix] avoid template literal syntax
• 3807e16 v15.7.0
• 36f829e [changelog] update repo links
• b67bbd4 [New] Add .elementType
• 8343e81 [Docs] fix relative release date to be absolute
• b4c8170 oneOf: improve warning when multiple arguments are supplied
• 8e3cc5d [dev deps] update loose-envify
• 2a5e8fc [Tests] use componentName in getPropTypeWarningMessage instead of hard-coded ...
• a5ce17a Completely remove envify in favor of loose-envify
• Additional commits viewable in compare view

Maintainer changes

This version was pushed to npm by ljharb, a new releaser for prop-types since your current version.

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[Kadrian]

Closing in favor of #338

[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.