Update Announcements (#434)

Co-authored-by: Hack Bot <uclaacmhack+ghbot@gmail.com>

src/data/announcements.json

@@ -1,4 +1,10 @@
 [
+    {
+        "id": 14,
+        "subject": "Submission closed",
+        "body": "Lay down your keyboards hackers!\r\n\r\nSubmissions for HOTH XI are officially closed! Breathe a sigh of relief as the catharsis of the experience washes over you! Be proud of yourselves! You just finished a 12-hour hackathon!\r\n\r\nAt this point, our judging period will begin and last until the CLOSING CEREMONY STARTS AT 10:30PM! Please hang around and relax until then to hear the announcement of the winners and to potentially receive prizes! \r\n\r\nThank you all for participating!",
+        "timestamp": "2024-03-04T05:39:26Z"
+    },
     {
         "id": 13,
         "subject": "LAST CALL FOR PROJECT SUBMISSIONS!!!",