chore(deps-dev): bump ckeditor5 from 47.2.0 to 47.6.0 in /client

Bumps [ckeditor5](https://github.com/ckeditor/ckeditor5) from 47.2.0 to 47.6.0.
- [Release notes](https://github.com/ckeditor/ckeditor5/releases)
- [Changelog](https://github.com/ckeditor/ckeditor5/blob/master/CHANGELOG.md)
- [Commits](ckeditor/ckeditor5@v47.2.0...v47.6.0)

---
updated-dependencies:
- dependency-name: ckeditor5
  dependency-version: 47.6.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

client/package.json

@@ -150,7 +150,7 @@
     "babel-plugin-react-remove-properties": "^0.3.0",
     "babel-plugin-transform-import-meta": "^2.2.1",
     "babel-plugin-transform-react-remove-prop-types": "^0.4.24",
-    "ckeditor5": "^47.2.0",
+    "ckeditor5": "^47.6.0",
     "compression-webpack-plugin": "^12.0.0",
     "css-loader": "^6.11.0",
     "cssnano": "^6.1.2",