Bump ionicons from 6.1.3 to 7.1.0 in /searx/static/themes/simple

Bumps [ionicons](https://github.com/ionic-team/ionicons) from 6.1.3 to 7.1.0.
- [Release notes](https://github.com/ionic-team/ionicons/releases)
- [Changelog](https://github.com/ionic-team/ionicons/blob/main/CHANGELOG.md)
- [Commits](https://github.com/ionic-team/ionicons/compare/v6.1.3...v7.1.0

)

---
updated-dependencies:
- dependency-name: ionicons
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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