Set targetSdkVersion to API 29.

- This change also upgradle to robolectric 4.3.1 to
  be able to target API 29
- Updating AnimationDurationScaleRule to use a different method
  that is not hidden by ART.

Test: ./gradlew buildOnServer
Change-Id: I22719c8877faf5aada6f7f9c8017cee2515c2b91

• appcompat/appcompat/src/main/java/androidx/appcompat/widget/SearchView.java[diff]
• buildSrc/src/main/kotlin/androidx/build/SupportConfig.kt[diff]
• buildSrc/src/main/kotlin/androidx/build/dependencies/Dependencies.kt[diff]
• testutils/testutils-runtime/src/main/java/androidx/testutils/AnimationDurationScaleRule.kt[diff]
• transition/transition/src/main/java/androidx/transition/ViewGroupUtilsApi14.java[diff]
• transition/transition/src/main/java/androidx/transition/ViewUtilsBase.java[diff]