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

Bumps [grunt-contrib-jshint](https://github.com/gruntjs/grunt-contrib-jshint) from 3.0.0 to 3.1.1.
- [Release notes](https://github.com/gruntjs/grunt-contrib-jshint/releases)
- [Changelog](https://github.com/gruntjs/grunt-contrib-jshint/blob/main/CHANGELOG)
- [Commits](https://github.com/gruntjs/grunt-contrib-jshint/commits/v3.1.1)

---
updated-dependencies:
- dependency-name: grunt-contrib-jshint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

searx/static/themes/simple/package.json

@@ -5,7 +5,7 @@
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-concat": "~1.0.1",
     "grunt-contrib-cssmin": "^4.0.0",
-    "grunt-contrib-jshint": "~3.0.0",
+    "grunt-contrib-jshint": "~3.1.1",
     "grunt-contrib-less": "~3.0.0",
     "grunt-contrib-uglify": "~5.0.1",
     "grunt-contrib-watch": "~1.1.0",