Bump geoip2/geoip2 from 3.0.0 to 3.1.0 in /_backend (#3677)

Bumps [geoip2/geoip2](https://github.com/maxmind/GeoIP2-php) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/maxmind/GeoIP2-php/releases)
- [Changelog](https://github.com/maxmind/GeoIP2-php/blob/main/CHANGELOG.md)
- [Commits](maxmind/GeoIP2-php@v3.0.0...v3.1.0)

---
updated-dependencies:
- dependency-name: geoip2/geoip2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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