feat(app): bump firebase-android-sdk / firebase-ios-sdk versions

firebase-android-sdk goes to 26.2.0
firebase-ios-sdk goes to 7.3.0

Note that if you pod update, Firebase/DynamicLinks will go to 7.3.1 as
they fixed a regression from 7.3.0 with a special
release of just that package

Author: mikehardy

packages/app/package.json

@@ -62,14 +62,14 @@
   },
   "sdkVersions": {
     "ios": {
-      "firebase": "~> 7.2.0"
+      "firebase": "~> 7.3.0"
     },
     "android": {
       "minSdk": 16,
       "targetSdk": 30,
       "compileSdk": 30,
       "buildTools": "30.0.2",
-      "firebase": "26.1.1",
+      "firebase": "26.2.0",
       "playServicesAuth": "19.0.0"
     }
   }

tests/ios/Podfile

@@ -2,7 +2,7 @@ platform :ios, '10.0'
 $RNFirebaseAsStaticFramework = false
 
 # Version override testing
-$FirebaseSDKVersion = '7.2.0'
+$FirebaseSDKVersion = '7.3.0'
 
 require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'