ui: bump @tinymce/tinymce-vue from 6.2.0 to 6.3.0 in /ui

Bumps [@tinymce/tinymce-vue](https://github.com/tinymce/tinymce-vue) from 6.2.0 to 6.3.0.
- [Changelog](https://github.com/tinymce/tinymce-vue/blob/main/CHANGELOG.md)
- [Commits](tinymce/tinymce-vue@6.2.0...6.3.0)

---
updated-dependencies:
- dependency-name: "@tinymce/tinymce-vue"
  dependency-version: 6.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]