Bump loader-utils and @docusaurus/core in /website

Bumps [loader-utils](https://github.com/webpack/loader-utils) to 1.4.2 and updates ancestor dependency [@docusaurus/core](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus). These dependencies need to be updated together.


Updates `loader-utils` from 1.4.0 to 1.4.2
- [Release notes](https://github.com/webpack/loader-utils/releases)
- [Changelog](https://github.com/webpack/loader-utils/blob/v1.4.2/CHANGELOG.md)
- [Commits](webpack/loader-utils@v1.4.0...v1.4.2)

Updates `@docusaurus/core` from 2.0.0-alpha.58 to 2.4.3
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v2.4.3/packages/docusaurus)

---
updated-dependencies:
- dependency-name: loader-utils
  dependency-type: indirect
- dependency-name: "@docusaurus/core"
  dependency-type: direct:production
...

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