Update GHEvent.java

seems we are rehashing this issue: https://issues.jenkins.io/browse/JENKINS-63348

adding `Pull request review thread` and `Merge queue entry` events to avoid breaking auth

Author: philippebailer

src/main/java/org/kohsuke/github/GHEvent.java

@@ -38,6 +38,7 @@ public enum GHEvent {
     MARKETPLACE_PURCHASE,
     MEMBER,
     MEMBERSHIP,
+    MERGE_QUEUE_ENTRY,
     META,
     MILESTONE,
     ORGANIZATION,
@@ -52,6 +53,7 @@ public enum GHEvent {
     PULL_REQUEST,
     PULL_REQUEST_REVIEW,
     PULL_REQUEST_REVIEW_COMMENT,
+    PULL_REQUEST_REVIEW_THREAD,
     PUSH,
     REGISTRY_PACKAGE,
     RELEASE,