Bump ckeditor5 from 47.5.0 to 47.6.0

Bumps [ckeditor5](https://github.com/ckeditor/ckeditor5) from 47.5.0 to 47.6.0.
- [Release notes](https://github.com/ckeditor/ckeditor5/releases)
- [Changelog](https://github.com/ckeditor/ckeditor5/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ckeditor/ckeditor5/compare/v47.5.0...v47.6.0)

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

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

package.json

@@ -51,7 +51,7 @@
         "bootbox": "^6.0.0",
         "bootswatch": "^5.1.3",
         "bs-custom-file-input": "^1.3.4",
-        "ckeditor5": "^47.0.0",
+        "ckeditor5": "^47.6.0",
         "clipboard": "^2.0.4",
         "compression-webpack-plugin": "^11.1.0",
         "datatables.net": "^2.0.0",