Increment skip to avoid infini-loop (#13703) (#13728)

Signed-off-by: Njolheiser <john.olheiser@gmail.com>
Co-authored-by: NLauris BH <lauris@nix.lv>
Co-authored-by: NLauris BH <lauris@nix.lv>

services/pull/pull.go

@@ -567,7 +567,7 @@ func GetCommitMessages(pr *models.PullRequest) string {
 				}
 				element = element.Next()
 			}
-
+			skip += limit
 		}
 	}