Bump the all-submodules group with 2 updates (#145)

Bumps the all-submodules group with 2 updates: [extern/googletest](https://github.com/google/googletest) and [extern/json](https://github.com/nlohmann/json).


Updates `extern/googletest` from `850cb69` to `a35bc76`
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@850cb69...a35bc76)

Updates `extern/json` from `8167d2f` to `f534f4f`
- [Release notes](https://github.com/nlohmann/json/releases)
- [Commits](nlohmann/json@8167d2f...f534f4f)

---
updated-dependencies:
- dependency-name: extern/googletest
  dependency-version: a35bc7693c117a048152beeb34f6aac354b9423f
  dependency-type: direct:production
  dependency-group: all-submodules
- dependency-name: extern/json
  dependency-version: f534f4f75e12893716ea688679aeb768bff426c4
  dependency-type: direct:production
  dependency-group: all-submodules
...

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Author: dependabot[bot]