Bump AppCompat Activity and Fragment versions
Bump AppCompat Activity and Fragment versions

Upgrade to Activity 1.2.4 and Fragment 1.3.6 to address bugs in previous
library versions.

RelNote: "AppCompat now depends on `Activity 1.2.4` and `Fragment
1.3.6`."
Test: ./gradlew bOS

Change-Id: I8fbecaffdb3a74946a8bf938f1c2722910499b34

AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx