Remove API 23 from CI due to flakiness

Author: dturner

.github/workflows/Build.yaml

@@ -64,7 +64,7 @@ jobs:
     timeout-minutes: 55
     strategy:
       matrix:
-        api-level: [23, 26, 30]
+        api-level: [26, 30]
 
     steps:
       - name: Checkout