Bump nickurt/laravel-stopforumspam from 2.0 to 2.2 in /backend

Bumps [nickurt/laravel-stopforumspam](https://github.com/nickurt/laravel-stopforumspam) from 2.0 to 2.2.
- [Changelog](https://github.com/nickurt/laravel-stopforumspam/blob/master/CHANGELOG.md)
- [Commits](nickurt/laravel-stopforumspam@2.0...2.2)

---
updated-dependencies:
- dependency-name: nickurt/laravel-stopforumspam
  dependency-version: '2.2'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]