Api 33 is used by a many android users and flutter ci has not been updated to run on devices past api 30.
https://docs.flutter.dev/reference/supported-platforms

Turns out emulators use api 31 for some tests.
{"dependency": "android_virtual_device", "version": "31"}
in .ci.yaml