package/gnuchess: bump to version 6.2.8

https://lists.gnu.org/archive/html/info-gnu-chess/2021-05/msg00000.html

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 4cb36ff7707d7b591b2896b089ce2f6c76a99275)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gnuchess/gnuchess.hash

@@ -1,3 +1,3 @@
 # sha256 locally computed
-sha256  e536675a61abe82e61b919f6b786755441d9fcd4c21e1c82fb9e5340dd229846  gnuchess-6.2.7.tar.gz
+sha256  d50446cda8012240321da39cddbb4df4d08458a8d538a4738882814139583847  gnuchess-6.2.8.tar.gz
 sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/gnuchess/gnuchess.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GNUCHESS_VERSION = 6.2.7
+GNUCHESS_VERSION = 6.2.8
 GNUCHESS_SITE = $(BR2_GNU_MIRROR)/chess
 GNUCHESS_LICENSE = GPL-3.0+
 GNUCHESS_LICENSE_FILES = COPYING