dawn: use autorelease feature

Package version is automatically increased as described here:
https://github.com/openwrt/packages/issues/14537

Signed-off-by: Nick Hainke <vincent@systemli.org>

net/dawn/Makefile

@@ -6,7 +6,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dawn
 PKG_SOURCE_DATE:=2020-12-31
-PKG_RELEASE:=1
+PKG_RELEASE:=$(AUTORELEASE)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/berlin-open-wireless-lab/DAWN.git