fix 修复 类型转换bug string不可强转int

Signed-off-by: 疯狂的狮子Li <15040126243@163.com>

sms4j-core/src/main/java/org/dromara/sms4j/core/proxy/processor/SingleBlendRestrictedProcessor.java

@@ -61,7 +61,7 @@ public class SingleBlendRestrictedProcessor implements SmsProcessor, SmsDaoAware
         }
         int maximum = 0;
         try{
-             maximum = (int) maximumObj ;
+             maximum = Integer.parseInt(maximumObj) ;
         }catch (Exception e){
             log.error("获取厂商级发送上限参数错误！请检查！");
             throw new IllegalArgumentException("获取厂商级发送上限参数错误");