fix: Breaking change in firebase_vertexai package (#770)

Author: davidmigloz

packages/langchain_firebase/lib/src/chat_models/vertex_ai/mappers.dart

@@ -1,6 +1,8 @@
 // ignore_for_file: public_member_api_docs
 import 'dart:convert';
 
+// ignore: depend_on_referenced_packages, implementation_imports
+import 'package:firebase_ai/src/content.dart';
 import 'package:firebase_vertexai/firebase_vertexai.dart' as f;
 import 'package:langchain_core/chat_models.dart';
 import 'package:langchain_core/language_models.dart';
@@ -126,6 +128,7 @@ extension GenerateContentResponseMapper on f.GenerateContentResponse {
                 final f.InlineDataPart p => base64Encode(p.bytes),
                 final f.FileData p => p.fileUri,
                 f.FunctionResponse() || f.FunctionCall() => '',
+                UnknownPart() => '',
               },
             )
             .nonNulls

pubspec.yaml

@@ -76,7 +76,7 @@ melos:
         firebase_app_check: ^0.4.0
         firebase_auth: ^6.0.0
         firebase_core: ^4.0.0
-        firebase_vertexai: ^2.0.0 # TODO Migrate to new FirebaseAI module
+        firebase_vertexai: ^2.1.0 # TODO Migrate to new FirebaseAI module
         flat_buffers: ^23.5.26
         flutter_bloc: ^9.1.1
         flutter_markdown: ^0.7.7 # Package will be discontinued. Migrate to flutter_markdown_plus