CVE-2022-36009 Incorrect parsing of access level in gomatrixserverlib and dendrite

gomatrixserverlib is a Go library for matrix protocol federation. Dendrite is a Matrix homeserver written in Go, an alternative to Synapse. The power level parsing within gomatrixserverlib was failing to parse the "eventsdefault" key of the m.room.powerlevels event, defaulting the event default...