Bump grunt-contrib-cssmin in /searx/static/themes/simple

Bumps [grunt-contrib-cssmin](https://github.com/gruntjs/grunt-contrib-cssmin) from 4.0.0 to 5.0.0.
- [Release notes](https://github.com/gruntjs/grunt-contrib-cssmin/releases)
- [Changelog](https://github.com/gruntjs/grunt-contrib-cssmin/blob/main/CHANGELOG)
- [Commits](https://github.com/gruntjs/grunt-contrib-cssmin/compare/v4.0.0...v5.0.0)

---
updated-dependencies:
- dependency-name: grunt-contrib-cssmin
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

searx/static/themes/simple/package.json

@@ -3,7 +3,7 @@
     "eslint": "^8.18.0",
     "grunt": "~1.6.1",
     "grunt-contrib-copy": "^1.0.0",
-    "grunt-contrib-cssmin": "^4.0.0",
+    "grunt-contrib-cssmin": "^5.0.0",
     "grunt-contrib-less": "~3.0.0",
     "grunt-contrib-uglify": "~5.2.1",
     "grunt-xmlmin": "~0.1.8",