Update conference dates to 2026

Author: torydebra

www/data/conf2026.json

@@ -496,9 +496,9 @@
   {
     "shortName": "RO-MAN",
     "name": "IEEE International Conference on Robot and Human Interactive Communication",
-    "start": "2025-08-24",
-    "end": "2025-08-28",
-    "deadline": "2025-03-15",
+    "start": "2026-08-24",
+    "end": "2026-08-28",
+    "deadline": "2026-03-15",
     "city": "Kitakyushu",
     "country": "Japan",
     "link": "https://ro-man2026.org/",