Update ACCV 2026 (#1371)

minor edit: capitalization

Author: gdemelo

conference/AI/accv.yml

@@ -22,4 +22,4 @@
         - deadline: '2026-07-05 23:59:59'
       timezone: UTC-12
       date: December 14-18, 2026
-      place: Osaka, japan
+      place: Osaka, Japan