build(deps): bump jsonschema from 4.17.3 to 4.18.0 in /nix

Bumps [jsonschema](https://github.com/python-jsonschema/jsonschema) from 4.17.3 to 4.18.0.
- [Release notes](https://github.com/python-jsonschema/jsonschema/releases)
- [Changelog](https://github.com/python-jsonschema/jsonschema/blob/main/CHANGELOG.rst)
- [Commits](python-jsonschema/jsonschema@v4.17.3...v4.18.0)

---
updated-dependencies:
- dependency-name: jsonschema
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>