package/znc: security bump to version 1.7.3

Changelog: https://wiki.znc.in/ChangeLog/1.7.3

Fixes CVE-2019-9917:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9917
- ZNC before 1.7.3-rc1 allows an existing remote user to cause a Denial
  of Service (crash) via invalid encoding.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/znc/znc.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256 60b4e78f54c532c32673d1ef8e5f606c530ef3a6d6b76ea1daa66459a86682a9  znc-1.7.2.tar.gz
+sha256 1e4cc31837a1e8e6cc310873659a167cec16a3fd4281cbc3bf364e42352c113d  znc-1.7.3.tar.gz
 sha256 cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30  LICENSE

package/znc/znc.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-ZNC_VERSION = 1.7.2
+ZNC_VERSION = 1.7.3
 ZNC_SITE = http://znc.in/releases/archive
 ZNC_LICENSE = Apache-2.0
 ZNC_LICENSE_FILES = LICENSE