Update uiautomator references in libraries/flicker * Remove unused dependencies. * Replace "ub-uiautomator" (v2.2.0) with "androidx.test.uiautomator_uiautomator" (v2.3.0). Bug: 235842600 Test: presubmit Change-Id: I3441eaec744b26bf837f79b66c7e2ebf4e8559c3