build(deps-dev): bump react-router

Bumps [react-router](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router) from 7.9.6 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/react-router@7.12.0/packages/react-router)

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

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

Author: dependabot[bot]

packages/apps/shopify-app-react-router/package.json

@@ -87,7 +87,7 @@
     "@shopify/shopify-app-session-storage-memory": "^5.0.4",
     "@types/react": "^19.2.2",
     "jest-fetch-mock": "^3.0.3",
-    "react-router": "7.9.6"
+    "react-router": "7.12.0"
   },
   "dependencies": {
     "@shopify/admin-api-client": "^1.1.1",