dawn: bump to latest version

Prepare DAWN for prometheus-node-exporter by always showing the whole
network overview.

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

net/dawn/Makefile

@@ -10,8 +10,8 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/berlin-open-wireless-lab/DAWN.git
-PKG_SOURCE_VERSION:=73c79989676f5b89f4547f4effc4497f5aaeea44
-PKG_MIRROR_HASH:=a5bf4bf58e3352316800a1f5d4cfb750a09f4f43c1494c5560d71a22fa267c55
+PKG_SOURCE_VERSION:=3a6ef899983421ede69bd640741670328fc74cd0
+PKG_MIRROR_HASH:=5071ffd2ebf34b673871278b127fe05a4efef6f112a989e562ab7b854524445f
 
 PKG_MAINTAINER:=Nick Hainke <vincent@systemli.org>
 PKG_LICENSE:=GPL-2.0-only