build(deps): Bump react, react-dom and react-test-renderer

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

Updates `react` from 18.3.1 to 19.0.0
- [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/v19.0.0/packages/react)

Updates `react-dom` from 18.3.1 to 19.0.0
- [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/v19.0.0/packages/react-dom)

Updates `react-test-renderer` from 18.3.1 to 19.0.0
- [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/v19.0.0/packages/react-test-renderer)

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

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

app-frontend/package.json

@@ -10,8 +10,8 @@
   },
   "dependencies": {
     "next": "^15.1.0",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1"
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
   },
   "devDependencies": {
     "autoprefixer": "^10.4.20",
@@ -22,6 +22,6 @@
     "babel-jest": "^29.7.0",
     "identity-obj-proxy": "^3.0.0",
     "jest": "^29.7.0",
-    "react-test-renderer": "^18.3.1"
+    "react-test-renderer": "^19.0.0"
   }
 }