Use Pixel 3, API 28 instead of Pixel 4, API 29

This pixel 4 device seems to be getting unusual and inconsistent gmscore issues not replicable on other devices, even on the same API level.

Switch to a different device to avoid these.

Author: anonymous-akorn

.github/workflows/cpp-packaging.yml

@@ -620,8 +620,8 @@ jobs:
       fail-fast: false
     env:
       apis: admob,analytics,auth,database,dynamic_links,firestore,functions,instance_id,messaging,remote_config,storage
-      android_device: flame
-      android_api: 29
+      android_device: blueline
+      android_api: 28
       ios_device: iphone11pro
       ios_version: 13.3
     steps:

.github/workflows/integration_tests.yml

@@ -17,10 +17,10 @@ on:
         required: true
       android_device:
         description: 'Android device model'
-        default: 'flame'
+        default: 'blueline'
       android_api:
         description: 'Android API level'
-        default: '29'
+        default: '28'
       ios_device:
         description: 'iOS device model'
         default: 'iphone11pro'