Update git submodules

* Update Wikibase from branch 'master'
  to 87ddd5febb32fe2d2793cca255e8410c76789529
  - Merge "Bump grunt-banana-checker from 0.9.0 to 0.10.0"
  - Bump grunt-banana-checker from 0.9.0 to 0.10.0
    
    Bumps [grunt-banana-checker](https://github.com/wikimedia/banana-checker) from 0.9.0 to 0.10.0.
    - [Release notes](https://github.com/wikimedia/banana-checker/releases)
    - [Changelog](https://github.com/wikimedia/banana-checker/blob/master/History.md)
    - [Commits](wikimedia/banana-checker@v0.9.0...v0.10.0)
    
    ---
    updated-dependencies:
    - dependency-name: grunt-banana-checker
      dependency-type: direct:development
      update-type: version-update:semver-minor
    ...
    
    Signed-off-by: dependabot[bot] <[email protected]>
    Pull Request: wikimedia/mediawiki-extensions-Wikibase#343
    Change-Id: Iea9e7d1ec41dec77331b13e6e82c97df364e0c90

Author: jenkins-bot