Add "Accept" header topic to October meeting (#261)

Author: benjie

working-group/agendas/2023/2023-10-26.md

@@ -112,4 +112,5 @@ Jovi De Croock          | @JoviDeCroock          | Stellate                | Aal
 1. Determine volunteers for note taking (1m, Organizer)
 1. Review agenda (2m, Organizer)
 1. Review previous meeting's action items (5m, Organizer)
-1. Review persisted operations RFC (5m, @JoviDeCroock)
+1. Review persisted operations RFC (10m, @JoviDeCroock)
+1. ["Accept" header PR](https://github.com/graphql/graphql-over-http/pull/227) decision (15m, Benjie)