Example app's notification_test is crashing on Android 14

[bartekpacia]

Android 14 made it harder to schedule notifications at exact time (see docs). Because of that, the example app is crashing:

on Android 14.

• flutter_local_notifications has to be updated
• notifications_test should be updated as well

See PR #1776 where I started work but didn't have time to finish it.

[bartekpacia]

After we fix this, let's run our Android CI on some Android 14 devices to make sure it's fixed.

[github-actions]

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