`AccountSettingsMigration21Test.testCancelsSyncAndClearsPendingState` sometimes fails

[rfc2822]

Like in https://github.com/bitfireAT/davx5-ose/actions/runs/19630788473/job/56209837387

> Task :app:virtualOseDebugAndroidTest

at.bitfire.davdroid.settings.migration.AccountSettingsMigration21Test > testCancelsSyncAndClearsPendingState[virtual] FAILED 
	java.lang.AssertionError
	at org.junit.Assert.fail(Assert.java:87)

[rfc2822]

https://github.com/bitfireAT/davx5/actions/runs/19634493261/job/56223362517