Update icassp.yml (#1536)

Author: MorleyOlsen

conference/CG/icassp.yml

@@ -51,7 +51,7 @@
       id: icassp27
       link: https://2027.ieeeicassp.org/
       timeline:
-        - deadline: 'TBD'
+        - deadline: '2026-09-16 23:59:59'
       timezone: UTC-12
       date: May 16-21, 2027
       place: Toronto, Canada