[css-scrollbars] Fix link

Author: frivoal

css-scrollbars-1/Overview.bs

@@ -482,8 +482,8 @@ Appendix B. Changes</h2>
 
 	This appendix is <em>non-normative</em>.
 
-<h3 class="no-num" id="changes-since-2021-12-06">
-Changes since the <a href="https://www.w3.org/TR/2021/CR-css-scrollbars-1-20211206/">6 December 2021 Candidate Recommendation</a></h3>
+<h3 class="no-num" id="changes-since-2021-12-09" oldids="changes-since-2021-12-06">
+Changes since the <a href="https://www.w3.org/TR/2021/CR-css-scrollbars-1-20211200/">9 December 2021 Candidate Recommendation</a></h3>
 
 	<wpt title="This section is not normative, it does not need tests."></wpt>