Upgrade: [dependabot] - bump react-dom and @types/react-dom

Bumps [react-dom](https://github.com/facebook/react/tree/HEAD/packages/react-dom) and [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom). These dependencies needed to be updated together.

Updates `react-dom` from 18.3.1 to 19.2.1
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v19.2.1/packages/react-dom)

Updates `@types/react-dom` from 18.3.1 to 19.2.3
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react-dom)

---
updated-dependencies:
- dependency-name: react-dom
  dependency-version: 19.2.1
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/react-dom"
  dependency-version: 19.2.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -22,7 +22,7 @@
     "nhsuk-react-components": "^5.0.0",
     "pino": "^10.1.0",
     "react": "18.3.1",
-    "react-dom": "18.3.1",
+    "react-dom": "19.2.1",
     "react-router-dom": "6.30.1",
     "sass": "^1.94.2"
   },
@@ -34,7 +34,7 @@
     "@testing-library/user-event": "^14.5.2",
     "@types/govuk-frontend": "^5.11.0",
     "@types/react": "18.3.1",
-    "@types/react-dom": "18.3.1",
+    "@types/react-dom": "19.2.3",
     "@vitejs/plugin-react-swc": "^4.2.2",
     "axios-mock-adapter": "^2.1.0",
     "sass": "^1.94.2",