Bump react-router-dom from 6.23.0 to 7.8.0 in /frontend

Bumps [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom) from 6.23.0 to 7.8.0.
- [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/react-router-dom@7.8.0/packages/react-router-dom)

---
updated-dependencies:
- dependency-name: react-router-dom
  dependency-version: 7.8.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/package.json

@@ -29,7 +29,7 @@
     "react-hot-toast": "2.4.1",
     "react-is": "18.2.0",
     "react-multi-select-component": "4.3.4",
-    "react-router-dom": "6.23.0",
+    "react-router-dom": "7.8.0",
     "sass": "1.66.1",
     "styled-components": "6.1.8",
     "use-debounce": "10.0.0",