package/memtest86: bump version to 7.20

For change log since 6.20, see:
https://github.com/memtest86plus/memtest86plus/releases/tag/v7.20
https://github.com/memtest86plus/memtest86plus/releases/tag/v7.00

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/memtest86/memtest86.hash

@@ -1,3 +1,3 @@
 # locally computed using sha256sum
-sha256  463b2db66128e45c96be76136272e2ee940f1319804b1b88cc2ef04edccd01d8  memtest86-6.20.tar.gz
+sha256  8bad4b5788bc28e4dd1db78c9069bd0c65a4a6baf16409ab537c795bb04578b3  memtest86-7.20.tar.gz
 sha256  8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  LICENSE

package/memtest86/memtest86.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MEMTEST86_VERSION = 6.20
+MEMTEST86_VERSION = 7.20
 MEMTEST86_SITE = $(call github,memtest86plus,memtest86plus,v$(MEMTEST86_VERSION))
 MEMTEST86_LICENSE = GPL-2.0
 MEMTEST86_LICENSE_FILES = LICENSE