[automerge] Lower per-app notificationchannel limit 2p: 36acdd6758

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20084465

Bug: 240422263
Change-Id: Ie5ace372525c2245f4067a921e4449abc3df91bc
Merged-In: I8c12e3fc73e4a88842af275feaf2acffcced0402