Adding projectId field in DownstreamPipeline (#1301)

Co-authored-by: Mohamed MAHMOUDI <mohamed.mahmoudi@netvlm.onmicrosoft.com>

Author: mbench777

gitlab4j-models/src/main/java/org/gitlab4j/api/models/DownstreamPipeline.java

@@ -9,6 +9,7 @@ public class DownstreamPipeline implements Serializable {
     private static final long serialVersionUID = 1L;
 
     private Long id;
+    private Long projectId;
     private String sha;
     private String ref;
     private String status;
@@ -24,6 +25,14 @@ public void setId(Long id) {
         this.id = id;
     }
 
+    public Long getProjectId() {
+        return projectId;
+    }
+
+    public void setProjectId(Long projectId) {
+        this.projectId = projectId;
+    }
+
     public String getSha() {
         return sha;
     }

gitlab4j-models/src/test/resources/org/gitlab4j/models/bridge.json

@@ -50,6 +50,7 @@
   },
   "downstream_pipeline": {
     "id": 5,
+    "project_id": 8,
     "sha": "f62a4b2fb89754372a346f24659212eb8da13601",
     "ref": "main",
     "status": "pending",