Bump third_party/json from 697c7e5 to 230bfd1 (#110)

Bumps [third_party/json](https://github.com/nlohmann/json) from `697c7e5` to `230bfd1`.
- [Release notes](https://github.com/nlohmann/json/releases)
- [Commits](nlohmann/json@697c7e5...230bfd1)

---
updated-dependencies:
- dependency-name: third_party/json
  dependency-version: 230bfd15a2bb7f01ebb3fcd3cf898b697ef43c48
  dependency-type: direct:production
...

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Author: dependabot[bot]