That’s not true, Android SDK 33 has been around since August, but gradle 8 was released in February this year, and android gradle plugin 8 was released last week (required for using gradle 8 in Android projects).
Anyway, Capacitor 5 will use gradle 8, it was updated yesterday, but still not released.
It was initially updated to use Android Gradle Plugin 7.4.1, which supports SDK 33.
You should be able to use Capacitor 5 beta to get rid of those errors.