app must target api34 by Aug 31

[r10s]

the yearly dance ... did not check out which new requirements are needed this time.

[adbenitez]

documentation: https://developer.android.com/about/versions/14/behavior-changes-14

[r10s]

i checked some points of the link:

• android core libraries: we're not using java.util.regex.Matcher, java.util.UUID.fromString(), TileService or ProGuard
• JobScheduler reinforces callback and network behavior: JobScheduler is not used by us, WorkManager is quit after 1 minute, that's probably fine - but we could improve by using new dc_accounts_background_fetch() which cares for i/o, can be called unconditionally and is used successfully on iOS since some time

todo:

• foreground service types are required, https://developer.android.com/about/versions/14/changes/fgs-types-required

(the "Android SDK Upgrade Assistent" is available in the "Tools" Menu)