Move to Gradle 4.7 nightly.
Move to Gradle 4.7 nightly.

In an attempt to deflake out builds we are moving
to Gradle 4.7 nightly that is supposed to have a
new logic for dependency resolution.

Test: ./gradlew assembleDebug
Change-Id: I58d723b6e8cee14f01b23b0cffdf1011adb25e5b

androidx/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,AndroidX/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,AndroidX/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx