Update json requirement from 2.5.1 to 2.6.1 (#262)
Updates the requirements on [json](https://github.com/flori/json) to permit the latest version.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](https://github.com/flori/json/compare/v2.5.1...v2.6.1)
---
updated-dependencies:
- dependency-name: json
dependency-type: direct:production
...
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