Add DDL for EGSR, ISWC, ICMR defer (#1339)

Author: limberc

conference/CG/egsr.yml

@@ -20,8 +20,8 @@
       id: egsr2026
       link: https://egsr2026.inria.fr/
       timeline:
-        - abstract_deadline: 'TBD'
-          deadline: 'TBD'
+        - abstract_deadline: '2026-04-08 23:59:59'
+          deadline: '2026-04-15 23:59:59'
       timezone: UTC
       date: July 1-3, 2026
       place: Bordeaux, France

conference/CG/icmr.yml

@@ -27,7 +27,7 @@
       id: icmr26
       link: https://icmr2026.org/calls.html
       timeline:
-        - deadline: '2026-02-06 23:59:59'
+        - deadline: '2026-02-13 23:59:59'
       timezone: UTC-12
       date: June 16-19, 2026
       place: Amsterdam, Netherlands

conference/DB/iswc.yml

@@ -49,8 +49,8 @@
       id: iswc26
       link: https://iswc2026.semanticweb.org/
       timeline:
-        - abstract_deadline: 'TBD'
-          deadline: 'TBD'
+        - abstract_deadline: '2026-05-02 23:59:59'
+          deadline: '2026-05-07 23:59:59'
       timezone: AoE
       date: October 25-29, 2026
       place: Bari, Italy