Bump submodules/nlohmann_json from 9cca280 to 30b2817

Bumps [submodules/nlohmann_json](https://github.com/nlohmann/json) from `9cca280` to `30b2817`.
- [Release notes](https://github.com/nlohmann/json/releases)
- [Commits](nlohmann/json@9cca280...30b2817)

---
updated-dependencies:
- dependency-name: submodules/nlohmann_json
  dependency-version: 30b28175e46827153d8a51d75540ef888aa83d8b
  dependency-type: direct:production
...

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

Author: dependabot[bot]