add news for 2025-02-28

Announce the code freeze and in track for the IOCCC28 to open
on **2025-03-05 23:19:17.131107 UTC**.

status.json

@@ -2,6 +2,6 @@
     "no_comment" : "mandatory comment: because comments were removed from the original JSON spec",
     "IOCCC_status_version" : "1.0 2024-03-09",
     "contest_status" : "pending",
-    "news_update" : "2025-02-13T00:39:06+00:00",
+    "news_update" : "2025-03-01T02:11:45+00:00",
     "status_update" : "2024-12-29T10:01:35+00:00"
 }