Remove api level 29 from android ci tests

.github/workflows/ci.yml

@@ -50,7 +50,8 @@ jobs:
     strategy:
       matrix:
         # api-level 19 is min sdk, but throws errors related to desugaring
-        api-level: [ 21, 29 ]
+        # api-level 29 currently not working https://github.com/ReactiveCircus/android-emulator-runner/issues/168 
+        api-level: [ 21 ]
     steps:
       - uses: actions/checkout@v2