Fix the docfx version

Author: Xavier-xuan

.github/workflows/main.yml

@@ -106,7 +106,7 @@ jobs:
 
     - name: Install DocFX
       run: |
-        dotnet tool update -g docfx
+        dotnet tool update -g docfx --version 2.61.0
 
     - name: Build Documentation
       working-directory: team_project # 进入项目目录