ci: use channel 3 when setting up Android emulator (#1695)
ci: use channel 3 when setting up Android emulator (#1695)

Description: Fixes Android emulator failing with `Package "Android Emulator" with revision at least 30.8.2 not available.` when CI jobs for Android hello world apps (Java and Kotlin) are run.
Risk Level: None
Testing: CI

Signed-off-by: Rafal Augustyniak <c112854348d0b65cbb3818b4bb8eb5588417f7f1@lyft.com>
envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile