Bump firebase_core from 1.14.1 to 1.15.0 in /experimental/web_dashboard (#1124)

experimental/web_dashboard/pubspec.lock

@@ -245,7 +245,7 @@ packages:
       name: firebase_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.1"
+    version: "1.15.0"
   firebase_core_platform_interface:
     dependency: transitive
     description:

experimental/web_dashboard/pubspec.yaml

@@ -10,7 +10,7 @@ dependencies:
   cloud_firestore: ^3.1.13
   cupertino_icons: ^1.0.0
   firebase_auth: ^3.3.15
-  firebase_core: ^1.7.0
+  firebase_core: ^1.15.0
   google_sign_in: ^5.0.0
   json_annotation: ^4.1.0
   provider: ^6.0.0