fix(alerting): Update Matrix send endpoint to v3
@@ -69,7 +69,7 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
txnId := randStringBytes(24)
request, err := http.NewRequest(
http.MethodPut,
- fmt.Sprintf("%s/_matrix/client/r0/rooms/%s/send/m.room.message/%s?access_token=%s",
+ fmt.Sprintf("%s/_matrix/client/v3/rooms/%s/send/m.room.message/%s?access_token=%s",
config.ServerURL,
url.PathEscape(config.InternalRoomID),
txnId,
