Update package asterisk

- Reformatting voice ubus events
- Add some missing ubus events for call hold and pick-up

net/asterisk/Makefile

@@ -16,7 +16,7 @@ ifneq ($(LOCAL_DEV),1)
 PKG_SOURCE:=asterisk-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_SOURCE_URL:=https://dev.iopsys.eu/fork/asterisk.git
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_VERSION:=fed9f403dc480ed7018c34364bb4ecc11cd522a7
+PKG_SOURCE_VERSION:=f721d34bf5784c43ee1497545997629ca26217ec
 PKG_MIRROR_HASH:=skip
 endif