Increment axt versions for next release.

PiperOrigin-RevId: 435697291

Adds an additional test case to validate connectivity.

PiperOrigin-RevId: 428835874

Sept 28 2021 release

Sept 28, 2021 release

Fix espresso kotlin access by retaining kotlin.* libraries in proguard.

Fixes android#1139

PiperOrigin-RevId: 400777043

Add kotlin stdlin maven dependency to espresso-core and -ktx packages.

PiperOrigin-RevId: 392456650

Internal

PiperOrigin-RevId: 374248621