Bump thirdparty/json from 6eab7a2 to 9cca280

Bumps [thirdparty/json](https://github.com/nlohmann/json) from `6eab7a2` to `9cca280`.
- [Release notes](https://github.com/nlohmann/json/releases)
- [Commits](nlohmann/json@6eab7a2...9cca280)

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

Signed-off-by: dependabot[bot] <[email protected]>