Fix for Retrofit R8 issue, bump version to 0.1.2

[dturner]

This fixes an issue where data would not load from the backend because of an exception thrown by retrofit. Users would see a loading spinner for a short time but no new data would be loaded from the server. The following would be seen in logcat:

2023-07-26 15:59:15.186 12572-12678 suspendRunCatching      com...gle.samples.apps.nowinandroid  I  Failed to evaluate a suspendRunCatchingBlock. Returning failure Result
                                                                                                    java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType

Cause: square/retrofit#3751
Solution: Add proguard rules to stop Retrofit type information being removed

[SimonMarquis]

For reference

• Add proguard config for R8 to keep type information for generic signatures of retrofit2.Response square/retrofit#3910