proguard: update rules to account for AndroidNetworkLibrary (#2482)
proguard: update rules to account for AndroidNetworkLibrary (#2482)

Description: Update proguard so that AndroidNetworkLibrary is not stripped/obfuscated by proguard. Needed to fix https://github.com/envoyproxy/envoy-mobile/issues/2432.
Risk Level: Low, the change should be additive.
Testing: Manual.
Docs Changes: N/A
Release Notes: N/A
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