fix: issues by pydantic2 upgrade (#5171)

api/core/tools/provider/builtin/stackexchange/stackexchange.yaml

@@ -6,7 +6,7 @@ identity:
     zh_Hans: Stack Exchange
   description:
     en_US: Access questions and answers from the Stack Exchange and its sub-sites.
-    zh_Hans: 从Stack Exchange和其子论坛获取问题和答案。
+    zh_Hans: 从 Stack Exchange 和其子论坛获取问题和答案。
   icon: icon.svg
   tags:
     - search

api/core/tools/provider/builtin/stackexchange/tools/searchStackExQuestions.yaml

@@ -96,15 +96,15 @@ parameters:
       zh_Hans: 是否限制为只有已接受答案的问题。
     form: form
     options:
-      - value: true
+      - value: 'true'
         label:
           en_US: 'Yes'
           zh_Hans: 是
-      - value: false
+      - value: 'false'
         label:
           en_US: 'No'
           zh_Hans: 否
-    default: true
+    default: 'true'
   - name: pagesize
     type: number
     required: true