Bump video.js and vue-video-player in /frontend

Bumps [video.js](https://github.com/videojs/video.js) to 7.20.3 and updates ancestor dependency [vue-video-player](https://github.com/surmon-china/videojs-player/tree/HEAD/legacy). These dependencies need to be updated together.


Updates `video.js` from 6.13.0 to 7.20.3
- [Release notes](https://github.com/videojs/video.js/releases)
- [Changelog](https://github.com/videojs/video.js/blob/main/CHANGELOG.md)
- [Commits](videojs/video.js@v6.13.0...v7.20.3)

Updates `vue-video-player` from 5.0.2 to 6.0.0
- [Release notes](https://github.com/surmon-china/videojs-player/releases)
- [Changelog](https://github.com/surmon-china/videojs-player/blob/main/legacy/CHANGELOG.md)
- [Commits](https://github.com/surmon-china/videojs-player/commits/v6.0.0/legacy)

---
updated-dependencies:
- dependency-name: video.js
  dependency-type: indirect
- dependency-name: vue-video-player
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]