feat: bump Firebase JS SDK to 12.3.0

Author: SelaseKay

packages/firebase_core/firebase_core_web/lib/src/firebase_sdk_version.dart

@@ -6,4 +6,4 @@
 part of '../firebase_core_web.dart';
 
 /// The currently supported Firebase JS SDK version.
-const String supportedFirebaseJsSdkVersion = '12.2.1';
+const String supportedFirebaseJsSdkVersion = '12.3.0';