build(deps-dev): bump eslint-plugin-json from 3.1.0 to 4.0.1 in /backend

Bumps [eslint-plugin-json](https://github.com/azeemba/eslint-plugin-json) from 3.1.0 to 4.0.1.
- [Release notes](https://github.com/azeemba/eslint-plugin-json/releases)
- [Commits](https://github.com/azeemba/eslint-plugin-json/commits)

---
updated-dependencies:
- dependency-name: eslint-plugin-json
  dependency-version: 4.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]