build: bump react-markdown in /ResearchAssistant/App/frontend

Bumps [react-markdown](https://github.com/remarkjs/react-markdown) from 7.1.2 to 9.0.1.
- [Release notes](https://github.com/remarkjs/react-markdown/releases)
- [Changelog](https://github.com/remarkjs/react-markdown/blob/main/changelog.md)
- [Commits](remarkjs/react-markdown@7.1.2...9.0.1)

---
updated-dependencies:
- dependency-name: react-markdown
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]