Bump eslint-config-cityssm from 18.1.2 to 20.0.0

Bumps [eslint-config-cityssm](https://github.com/cityssm/eslint-config-cityssm) from 18.1.2 to 20.0.0.
- [Release notes](https://github.com/cityssm/eslint-config-cityssm/releases)
- [Commits](cityssm/eslint-config-cityssm@v18.1.2...v20.0.0)

---
updated-dependencies:
- dependency-name: eslint-config-cityssm
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]