build(deps-dev): bump @djthoms/eslint-config from 5.0.1 to 6.4.0

Bumps [@djthoms/eslint-config](https://github.com/atomicpages/eslint-config) from 5.0.1 to 6.4.0.
- [Release notes](https://github.com/atomicpages/eslint-config/releases)
- [Changelog](https://github.com/atomicpages/eslint-config/blob/main/CHANGELOG.md)
- [Commits](atomicpages/eslint-config@v5.0.1...v6.4.0)

---
updated-dependencies:
- dependency-name: "@djthoms/eslint-config"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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