Those are the versions you can use as targetSDK version (the SDK used to build your app), not the minSDK version (the minimum Android version your app will support). For targetSDK you should always try to use the latest available.
At this point you should be using SDK 32 as minimum targetSDK, the recommended would be SDK 33 as it will be required for Google Play submissions starting in August.
For the minSDK you can go as low as you want or your framework allows you, in Capacitor 5 you can use 22 as minimum (Android 5.1), and on cordova-android 12 you can use 24 as minimum (Android 7).