代码优化，更新 FeignRequestInterceptor 对 null 的检测，直接使用 `!= null` 代替 `StringUtils.isNotNull`，以免产生歧义

Signed-off-by: hjk2008 <hjk2008ext@163.com>

ruoyi-common/ruoyi-common-security/src/main/java/com/ruoyi/common/security/feign/FeignRequestInterceptor.java

@@ -22,7 +22,7 @@ public class FeignRequestInterceptor implements RequestInterceptor
     public void apply(RequestTemplate requestTemplate)
     {
         HttpServletRequest httpServletRequest = ServletUtils.getRequest();
-        if (StringUtils.isNotNull(httpServletRequest))
+        if (httpServletRequest != null)
         {
             Map<String, String> headers = ServletUtils.getHeaders(httpServletRequest);
             // 传递用户信息请求头，防止丢失