git: security bump to version 2.12.5

Release notes:
https://public-inbox.org/git/xmqqy3p29ekj.fsf@gitster.mtv.corp.google.com/

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/git/git.hash

@@ -1,2 +1,2 @@
 # From: https://www.kernel.org/pub/software/scm/git/sha256sums.asc
-sha256 f8b8ac499034e9f6e44e67dd54351bc5654e228e4cd3b55f6f1c8e736c977ce6  git-2.12.4.tar.xz
+sha256 a8c3b3c7dd9202d0e80f824ceb74b4340b60aa8f1ec4ffdde3e982fa5ae16eab  git-2.12.5.tar.xz

package/git/git.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GIT_VERSION = 2.12.4
+GIT_VERSION = 2.12.5
 GIT_SOURCE = git-$(GIT_VERSION).tar.xz
 GIT_SITE = https://www.kernel.org/pub/software/scm/git
 GIT_LICENSE = GPLv2, LGPLv2.1+