Bump http-proxy-middleware and @docusaurus/core in /website

Bumps [http-proxy-middleware](https://github.com/chimurai/http-proxy-middleware) to 2.0.7 and updates ancestor dependency [@docusaurus/core](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus). These dependencies need to be updated together.


Updates `http-proxy-middleware` from 0.19.1 to 2.0.7
- [Release notes](https://github.com/chimurai/http-proxy-middleware/releases)
- [Changelog](https://github.com/chimurai/http-proxy-middleware/blob/v2.0.7/CHANGELOG.md)
- [Commits](chimurai/http-proxy-middleware@v0.19.1...v2.0.7)

Updates `@docusaurus/core` from 2.0.0-alpha.61 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: http-proxy-middleware
  dependency-type: indirect
- dependency-name: "@docusaurus/core"
  dependency-type: direct:production
...

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