build(deps-dev): bump eslint-plugin-mozilla in /addon (#1126)

Bumps [eslint-plugin-mozilla](http://firefox-source-docs.mozilla.org/tools/lint/linters/eslint-plugin-mozilla.html) from 2.10.0 to 2.11.1.

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

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

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

Author: dependabot[bot]