fix: visibility 大小写问题

seecoder-gitlab-server/src/main/java/com/nju/edu/gitlab/service/impl/ProjectServiceImpl.java

@@ -360,8 +360,8 @@ public class ProjectServiceImpl implements ProjectService {
     @Override
     public VisibilityVO setProjectVisibility(VisibilityVO visibilityVO) throws GitLabApiException {
         if (visibilityVO == null || visibilityVO.getVisibility() == null ||
-                !Objects.equals(visibilityVO.getVisibility(), "PRIVATE") &&
-                !Objects.equals(visibilityVO.getVisibility(), "PUBLIC")) {
+                !Objects.equals(visibilityVO.getVisibility(), "private") &&
+                !Objects.equals(visibilityVO.getVisibility(), "public")) {
             throw new GitLabApiException("Invalid visibility found.");
         }
         Visibility visibility = Visibility.forValue(visibilityVO.getVisibility());