Bump serialize-javascript, @ckeditor/ckeditor5-dev-utils and terser-webpack-plugin

Bumps [serialize-javascript](https://github.com/yahoo/serialize-javascript) to 6.0.2 and updates ancestor dependencies [serialize-javascript](https://github.com/yahoo/serialize-javascript), [@ckeditor/ckeditor5-dev-utils](https://github.com/ckeditor/ckeditor5-dev/tree/HEAD/packages/ckeditor5-dev-utils) and [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin). These dependencies need to be updated together.


Updates `serialize-javascript` from 5.0.1 to 6.0.2
- [Release notes](https://github.com/yahoo/serialize-javascript/releases)
- [Commits](yahoo/serialize-javascript@v5.0.1...v6.0.2)

Updates `@ckeditor/ckeditor5-dev-utils` from 32.1.2 to 46.0.3
- [Release notes](https://github.com/ckeditor/ckeditor5-dev/releases)
- [Changelog](https://github.com/ckeditor/ckeditor5-dev/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ckeditor/ckeditor5-dev/commits/v46.0.3/packages/ckeditor5-dev-utils)

Updates `terser-webpack-plugin` from 4.2.3 to 5.3.11
- [Release notes](https://github.com/webpack-contrib/terser-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack/terser-webpack-plugin@v4.2.3...v5.3.11)

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-type: indirect
- dependency-name: "@ckeditor/ckeditor5-dev-utils"
  dependency-type: direct:development
- dependency-name: terser-webpack-plugin
  dependency-type: direct:development
...

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

Author: dependabot[bot]