fix: ui/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-REACTROUTER-17137394
- https://snyk.io/vuln/SNYK-JS-REACTROUTER-17137545
- https://snyk.io/vuln/SNYK-JS-REACTROUTER-17138701
- https://snyk.io/vuln/SNYK-JS-REACTROUTER-17138883
- https://snyk.io/vuln/SNYK-JS-REACTROUTER-17138887

ui/package.json

@@ -62,7 +62,7 @@
     "react-dom": "^19.0.0",
     "react-i18next": "^17.0.7",
     "react-markdown": "^10.1.0",
-    "react-router-dom": "^7.1.5",
+    "react-router-dom": "^7.15.0",
     "remark-gfm": "^4.0.1",
     "tailwind-merge": "^3.4.1"
   },