feat(ios, sdk): bump firebase-ios-sdk to v7.7.0

includes tests app Podfile.lock updates

Author: mikehardy

packages/app/package.json

@@ -62,7 +62,7 @@
   },
   "sdkVersions": {
     "ios": {
-      "firebase": "7.6.0"
+      "firebase": "7.7.0"
     },
     "android": {
       "minSdk": 16,