Bump node-forge and @docusaurus/core

Bumps [node-forge](https://github.com/digitalbazaar/forge) to 1.3.1 and updates ancestor dependency [@docusaurus/core](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus). These dependencies need to be updated together.


Updates `node-forge` from 0.10.0 to 1.3.1
- [Release notes](https://github.com/digitalbazaar/forge/releases)
- [Changelog](https://github.com/digitalbazaar/forge/blob/main/CHANGELOG.md)
- [Commits](digitalbazaar/forge@0.10.0...v1.3.1)

Updates `@docusaurus/core` from 2.0.0-beta.7 to 2.1.0
- [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/v2.1.0/packages/docusaurus)

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

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