ci: increase parallelism for a slow test (#263)

Author: ashishb

.github/workflows/adbe-unittests.yml

@@ -31,7 +31,7 @@ jobs:
     timeout-minutes: 30
 
     strategy:
-      max-parallel: 1
+      max-parallel: 2
       matrix:
         api-level: [21, 26]
         target: [default]  # Other option: google_apis