Unpin version from react-native-android in run_fantom_tests (#53795)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53795

I've published another docker image that should now work and unblock `run_fantom_tests`
so we don't need to pin the version to `v18.0` anymore:
https://github.com/react-native-community/docker-android

Changelog:
[Internal] [Changed] -

Reviewed By: huntie

Differential Revision: D82532516

fbshipit-source-id: 980c2feb053f9d096e70f37bb690e18cc8b87dc0