chore(deps): Bump google_mobile_ads

Bumps [google_mobile_ads](https://github.com/googleads/googleads-mobile-flutter/tree/main/packages) from 4.0.0 to 5.0.0.
- [Release notes](https://github.com/googleads/googleads-mobile-flutter/releases)
- [Commits](https://github.com/googleads/googleads-mobile-flutter/commits/HEAD/packages)

---
updated-dependencies:
- dependency-name: google_mobile_ads
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

flutter_news_example/packages/news_blocks_ui/pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
  flutter:
  sdk: flutter
  flutter_html: 3.0.0-beta.2
- google_mobile_ads: ^4.0.0
+ google_mobile_ads: ^5.0.0
  news_blocks:
  path: ../../api/packages/news_blocks
  path_provider_platform_interface: ^2.0.5