!355 修复sa-token-oauth2组件使用sa-token-fastjson2序列化导致的类型转换问题

Merge pull request !355 from 陆健伟/dev

sa-token-plugin/sa-token-oauth2/src/main/java/cn/dev33/satoken/oauth2/dao/SaOAuth2Dao.java

@@ -555,7 +555,7 @@ public class SaOAuth2Dao implements SaTtlMethods {
 		if(clientToken == null) {
 			return null;
 		}
-		return (ClientTokenModel)getSaTokenDao().getObject(splicingClientTokenSaveKey(clientToken));
+		return getSaTokenDao().getObject(splicingClientTokenSaveKey(clientToken), ClientTokenModel.class);
 	}