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
...

Signed-off-by: dependabot[bot] <support@github.com>

searx/static/themes/simple/package.json

@@ -11,7 +11,7 @@
     "grunt-eslint": "^24.0.0",
     "grunt-stylelint": "^0.16.0",
     "grunt-image": "^6.4.0",
-    "ionicons": "^6.0.2",
+    "ionicons": "^7.1.0",
     "less": "^4.1.3",
     "less-plugin-clean-css": "^1.5.1",
     "sharp": "^0.31.0",