De-standardize :closed pseudo-class (#27638)

This was dropped from the specification. Developers shouldn't use it and
it has unshipped from all browsers anyway.

w3c/csswg-drafts#11326

Author: ddbeck

css/selectors/closed.json

@@ -4,7 +4,6 @@
       "closed": {
         "__compat": {
           "description": "`:closed`",
-          "spec_url": "https://drafts.csswg.org/selectors-4/#open-state",
           "tags": [
             "web-features:open-closed"
           ],
@@ -33,9 +32,9 @@
             "webview_ios": "mirror"
           },
           "status": {
-            "experimental": true,
-            "standard_track": true,
-            "deprecated": false
+            "experimental": false,
+            "standard_track": false,
+            "deprecated": true
           }
         }
       }