Bump react-router-dom from 6.23.0 to 7.6.3 in /frontend

---
updated-dependencies:
- dependency-name: react-router-dom
  dependency-version: 7.6.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

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": "7.6.3",
     "sass": "1.66.1",
     "styled-components": "6.1.8",
     "use-debounce": "10.0.0",