Bump eslint-plugin-import from 2.27.5 to 2.28.0 in /backend

Bumps [eslint-plugin-import](https://github.com/import-js/eslint-plugin-import) from 2.27.5 to 2.28.0.
- [Release notes](https://github.com/import-js/eslint-plugin-import/releases)
- [Changelog](https://github.com/import-js/eslint-plugin-import/blob/main/CHANGELOG.md)
- [Commits](import-js/eslint-plugin-import@v2.27.5...v2.28.0)

---
updated-dependencies:
- dependency-name: eslint-plugin-import
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]