package/libgit2: security bump to 1.5.1

Fixes CVE-2023-22742: when compiled with BR2_PACKAGE_LIBSSH2,
libgit2 fails to verify SSH keys by default.

https://github.com/libgit2/libgit2/blob/v1.5.1/docs/changelog.md

Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libgit2/libgit2.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  8de872a0f201b33d9522b817c92e14edb4efad18dae95cf156cf240b2efff93e  libgit2-1.5.0.tar.gz
+sha256  7074f1e2697992b82402501182db254fe62d64877b12f6e4c64656516f4cde88  libgit2-1.5.1.tar.gz
 sha256  0fc09da43d666b5b0cf5695defc3100d5cf387936b260ebab37e396d7e0dbc83  COPYING

package/libgit2/libgit2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBGIT2_VERSION = 1.5.0
+LIBGIT2_VERSION = 1.5.1
 LIBGIT2_SITE = $(call github,libgit2,libgit2,v$(LIBGIT2_VERSION))
 LIBGIT2_LICENSE = \
 	GPL-2.0 with linking exception, \