Bump prismjs and react-syntax-highlighter in /app/frontend (#2791)

Bumps [prismjs](https://github.com/PrismJS/prism) to 1.30.0 and updates ancestor dependency [react-syntax-highlighter](https://github.com/react-syntax-highlighter/react-syntax-highlighter). These dependencies need to be updated together.


Updates `prismjs` from 1.29.0 to 1.30.0
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/v2/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.29.0...v1.30.0)

Updates `react-syntax-highlighter` from 15.6.1 to 16.1.0
- [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@v15.6.1...v16.1.0)

---
updated-dependencies:
- dependency-name: prismjs
  dependency-version: 1.30.0
  dependency-type: indirect
- dependency-name: react-syntax-highlighter
  dependency-version: 16.1.0
  dependency-type: direct:production
...

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Author: dependabot[bot]