Update cec.yml (#1420)

Author: dodoxxb

conference/AI/cec.yml

@@ -1,8 +1,8 @@
-- title: CEC
+- title: IEEE CEC
   description: IEEE Congress on Evolutionary Computation
   sub: AI
   rank:
-    ccf: N
+    ccf: C
     core: B
     thcpl: N
   dblp: cec
@@ -15,3 +15,11 @@
       timezone: UTC-12
       date: June 8-12, 2025
       place: Hangzhou, China
+    - year: 2026
+      id: cec2026
+      link: https://attend.ieee.org/wcci-2026/ieee-cec-2025/
+      timeline:
+        - deadline: '2026-01-31 23:59:59'
+      timezone: UTC-12
+      date: June 22-26, 2026
+      place: Maastricht Exhibition & Congress Centre (MECC), The Netherlands