Bump react-router-dom from 6.28.0 to 7.0.2 in /examples/form-structure

Bumps [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom) from 6.28.0 to 7.0.2.
- [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@7.0.2/packages/react-router-dom)

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

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

Author: dependabot[bot]

examples/form-structure/package.json

@@ -8,7 +8,7 @@
     "@trussworks/react-uswds": "^9.1.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
-    "react-router-dom": "^6.21.2",
+    "react-router-dom": "^7.0.2",
     "workbox-background-sync": "^7.0.0",
     "workbox-broadcast-update": "^7.0.0",
     "workbox-cacheable-response": "^7.0.0",