feat: bump version to 0.3.31-fix2 (#1592)

docker/docker-compose.yaml

 services:
   # API service
   api:
-    image: langgenius/dify-api:0.3.31-fix1
+    image: langgenius/dify-api:0.3.31-fix2
     restart: always
     environment:
       # Startup mode, 'api' starts the API server.
   # worker service
   # The Celery worker for processing the queue.
   worker:
-    image: langgenius/dify-api:0.3.31-fix1
+    image: langgenius/dify-api:0.3.31-fix2
     restart: always
     environment:
       # Startup mode, 'worker' starts the Celery worker for processing the queue.
 
   # Frontend web application.
   web:
-    image: langgenius/dify-web:0.3.31-fix1
+    image: langgenius/dify-web:0.3.31-fix2
     restart: always
     environment:
       EDITION: SELF_HOSTED