[css-color-4][editorial] Remove hardcoded publication date

Author: svgeesus

css-color-4/Overview.bs

@@ -1,8 +1,6 @@
 <pre class=metadata>
 Title: CSS Color Module Level 4
 Status: ED
-Date: 2022-11-01
-Deadline: 2023-01-05
 Prepare for TR: no
 Work Status: Testing
 ED: https://drafts.csswg.org/css-color-4/