build(deps): bump deps/json from e4643d1 to 4a6e6ca (#648)

Bumps [deps/json](https://github.com/nlohmann/json) from `e4643d1` to `4a6e6ca`.
- [Release notes](https://github.com/nlohmann/json/releases)
- [Commits](nlohmann/json@e4643d1...4a6e6ca)

---
updated-dependencies:
- dependency-name: deps/json
  dependency-type: direct:production
...

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Author: dependabot[bot]