git: security bump to version 2.12.3

Fixes CVE-2017-8386 - Git Shell Bypass By Abusing Less

For more details, see:
https://insinuator.net/2017/05/git-shell-bypass-by-abusing-less-cve-2017-8386/
http://www.mail-archive.com/git@vger.kernel.org/msg120982.html

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/git/git.hash

@@ -1,2 +1,2 @@
 # From: https://www.kernel.org/pub/software/scm/git/sha256sums.asc
-sha256 d21a9e23506e618d561fb25a8a7bd6134f927b86147930103487117a7a678c4a  git-2.12.2.tar.xz
+sha256 016124c54ce2db7a4c2bd26b0de21fbf8f6bcaee04842aa221c7243141df4e42  git-2.12.3.tar.xz

package/git/git.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GIT_VERSION = 2.12.2
+GIT_VERSION = 2.12.3
 GIT_SOURCE = git-$(GIT_VERSION).tar.xz
 GIT_SITE = https://www.kernel.org/pub/software/scm/git
 GIT_LICENSE = GPL-2.0, LGPL-2.1+