Bump path-to-regexp and react-router-dom

Removes [path-to-regexp](https://github.com/pillarjs/path-to-regexp). It's no longer used after updating ancestor dependency [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom). These dependencies need to be updated together.


Removes `path-to-regexp`

Updates `react-router-dom` from 5.2.0 to 6.26.2
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/main/packages/react-router-dom/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/[email protected]/packages/react-router-dom)

---
updated-dependencies:
- dependency-name: path-to-regexp
  dependency-type: indirect
- dependency-name: react-router-dom
  dependency-type: direct:production
...

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

package.json

@@ -25,7 +25,7 @@
     "react-dom": "^17.0.2",
     "react-helmet": "^6.1.0",
     "react-markdown": "^6.0.2",
-    "react-router-dom": "^5.2.0",
+    "react-router-dom": "^6.26.2",
     "react-syntax-highlighter": "^15.4.4",
     "remark-gfm": "^1.0.0",
     "s-ago": "^2.2.0",