Bump query-string from 5.1.1 to 6.13.1

Bumps [query-string](https://github.com/sindresorhus/query-string) from 5.1.1 to 6.13.1.
- [Release notes](https://github.com/sindresorhus/query-string/releases)
- [Commits](https://github.com/sindresorhus/query-string/compare/v5.1.1...v6.13.1

)

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