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

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
...

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