Bump react-markdown from 5.0.3 to 6.0.0 (#128)

Bumps [react-markdown](https://github.com/remarkjs/react-markdown) from 5.0.3 to 6.0.0.
- [Release notes](https://github.com/remarkjs/react-markdown/releases)
- [Changelog](https://github.com/remarkjs/react-markdown/blob/main/changelog.md)
- [Commits](https://github.com/remarkjs/react-markdown/compare/5.0.3...6.0.0)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

web/package.json

@@ -22,7 +22,7 @@
     "react-chartkick": "^0.5.0",
     "react-dom": "^17.0.2",
     "react-linkify": "^1.0.0-alpha",
-    "react-markdown": "^5.0.3",
+    "react-markdown": "^6.0.0",
     "react-markdown-editor-lite": "^1.2.4",
     "sass": "^1.32.8"
   },