mosquitto: bump to 1.6.9

Full changelog: https://mosquitto.org/blog/2020/02/version-1-6-9-released/

Nothing of particular relevant to OpenWrt, just general fixes.

Signed-off-by: Karl Palsson <karlp@etactica.com>

net/mosquitto/Makefile

@@ -9,7 +9,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mosquitto
-PKG_VERSION:=1.6.8
+PKG_VERSION:=1.6.9
 PKG_RELEASE:=1
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE.txt
@@ -17,7 +17,7 @@ PKG_CPE_ID:=cpe:/a:eclipse:mosquitto
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://mosquitto.org/files/source/
-PKG_HASH:=7df23c81ca37f0e070574fe74414403cf25183016433d07add6134366fb45df6
+PKG_HASH:=412979b2db0a0020bd02fa64f0a0de9e7000b84462586e32b67f29bb1f6c1685
 
 include $(INCLUDE_DIR)/package.mk