Bump react-router and react-router-dom in /admin

Bumps [react-router](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router) and [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom). These dependencies needed to be updated together.

Updates `react-router` from 7.9.1 to 7.12.0
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/main/packages/react-router/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/[email protected]/packages/react-router)

Updates `react-router-dom` from 7.9.1 to 7.12.0
- [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/[email protected]/packages/react-router-dom)

---
updated-dependencies:
- dependency-name: react-router
  dependency-version: 7.12.0
  dependency-type: direct:production
- dependency-name: react-router-dom
  dependency-version: 7.12.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

admin/package-lock.json

@@ -23,8 +23,8 @@
         "react": "^18.0.0",
         "react-day-picker": "^9.5",
         "react-dom": "^18.0.0",
-        "react-router": "^7.9",
-        "react-router-dom": "^7.9",
+        "react-router": "^7.12",
+        "react-router-dom": "^7.12",
         "react-select": "^5.9",
         "uikit": "^3.22.0",
         "underscore": "^1.13.0",