Bump react-syntax-highlighter and @types/react-syntax-highlighter

Bumps [react-syntax-highlighter](https://github.com/react-syntax-highlighter/react-syntax-highlighter) and [@types/react-syntax-highlighter](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-syntax-highlighter). These dependencies needed to be updated together.

Updates `react-syntax-highlighter` from 15.5.0 to 15.6.6
- [Release notes](https://github.com/react-syntax-highlighter/react-syntax-highlighter/releases)
- [Changelog](https://github.com/react-syntax-highlighter/react-syntax-highlighter/blob/master/CHANGELOG.MD)
- [Commits](react-syntax-highlighter/react-syntax-highlighter@15.5.0...v15.6.6)

Updates `@types/react-syntax-highlighter` from 15.5.6 to 15.5.13
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react-syntax-highlighter)

---
updated-dependencies:
- dependency-name: react-syntax-highlighter
  dependency-version: 15.6.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: "@types/react-syntax-highlighter"
  dependency-version: 15.5.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]