Add MANNEQUIN to GHCommentAuthorAssociation enum (#1753)

* Add MANNEQUIN value to GHCommentAuthorAssociation enum

* Update EnumTest for GHCommentAuthorAssociation with MANNEQUIN

This commit updates the EnumTest to reflect the addition of the MANNEQUIN value in the GHCommentAuthorAssociation enum. The test now checks for the correct number of enum values, which has been increased to 8 to include MANNEQUIN.

* Update GHCommentAuthorAssociation.java

* Update GHCommentAuthorAssociation.java

---------

Co-authored-by: Liam Newman <bitwiseman@gmail.com>

Author: choichanhyeok

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

@@ -23,6 +23,10 @@ public enum GHCommentAuthorAssociation {
      * Author has not previously committed to the repository.
      */
     FIRST_TIME_CONTRIBUTOR,
+    /**
+     * Author is a placeholder for an unclaimed user.
+     */
+    MANNEQUIN,
     /**
      * Author is a member of the organization that owns the repository.
      */

src/test/java/org/kohsuke/github/EnumTest.java

@@ -22,7 +22,7 @@ public void touchEnums() {
         assertThat(GHCheckRun.Conclusion.values().length, equalTo(9));
         assertThat(GHCheckRun.Status.values().length, equalTo(4));
 
-        assertThat(GHCommentAuthorAssociation.values().length, equalTo(7));
+        assertThat(GHCommentAuthorAssociation.values().length, equalTo(8));
 
         assertThat(GHCommitState.values().length, equalTo(4));