Bump league/climate from 3.8.2 to 3.9.0 in /_backend (#3671)

Bumps [league/climate](https://github.com/thephpleague/climate) from 3.8.2 to 3.9.0.
- [Changelog](https://github.com/thephpleague/climate/blob/main/CHANGELOG.md)
- [Commits](thephpleague/climate@3.8.2...3.9.0)

---
updated-dependencies:
- dependency-name: league/climate
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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