fix: restore xinference secret field (#6941)

Co-authored-by: liuzhenghua-jk <liuzhenghua-jk@360shuke.com>

api/core/model_runtime/model_providers/xinference/xinference.yaml

@@ -33,7 +33,7 @@ model_credential_schema:
       label:
         zh_Hans: 服务器URL
         en_US: Server url
-      type: text-input
+      type: secret-input
       required: true
       placeholder:
         zh_Hans: 在此输入Xinference的服务器地址，如 http://192.168.1.100:9997
@@ -51,7 +51,7 @@ model_credential_schema:
       label:
         zh_Hans: API密钥
         en_US: API key
-      type: text-input
+      type: secret-input
       required: false
       placeholder:
         zh_Hans: 在此输入您的API密钥