fix bug that sort comments incorrectly

Author: yaito3014

dist/index.js

@@ -189,13 +189,12 @@ if (body) {
     repo,
     issue_number: pull_request_number,
   });
+
+  const compareDate = (a: Date, b: Date) => a == b ? 0 : a < b ? -1 : 1;
+
   const sorted_comments = comments
     .filter((comment) => comment.user?.login == "cppwarningnotifier[bot]")
-    .toSorted(
-      (a, b) =>
-        new Date(a.created_at).getSeconds() -
-        new Date(b.created_at).getSeconds()
-    );
+    .toSorted((a, b) => compareDate(new Date(a.created_at), new Date(b.created_at)));
   if (sorted_comments.length > 0) {
     const latest_comment = sorted_comments[sorted_comments.length - 1];
     await octokit.graphql(`