Update uiautomator references in tests/AlarmManager

* Remove unused dependencies.
* Replace "ub-uiautomator" (v2.2.0) with
  "androidx.test.uiautomator_uiautomator" (v2.3.0).

Bug: 235842600
Test: atest CtsAlarmManagerTestCases
Change-Id: I6978050ff52016aeb442f17969f02c72ea784870
3 files changed