build(deps): bump multi-ini and eslint-plugin-mozilla in /frontend (#1581)

Bumps [multi-ini](https://github.com/evangelion1204/multi-ini) to 2.2.0 and updates ancestor dependency [eslint-plugin-mozilla](http://firefox-source-docs.mozilla.org/tools/lint/linters/eslint-plugin-mozilla.html). These dependencies need to be updated together.


Updates `multi-ini` from 2.1.0 to 2.2.0
- [Release notes](https://github.com/evangelion1204/multi-ini/releases)
- [Commits](https://github.com/evangelion1204/multi-ini/commits)

Updates `eslint-plugin-mozilla` from 2.9.2 to 2.12.5

---
updated-dependencies:
- dependency-name: multi-ini
  dependency-type: indirect
- dependency-name: eslint-plugin-mozilla
  dependency-type: direct:development
...

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]