configs/mx6cubox: bump U-Boot version

now, the build requires host-swig
which is given by BR2_TARGET_UBOOT_NEEDS_PYLIBFDT

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
diff --git a/configs/mx6cubox_defconfig b/configs/mx6cubox_defconfig
index 2d711dc..5ed28e5 100644
--- a/configs/mx6cubox_defconfig
+++ b/configs/mx6cubox_defconfig
@@ -32,8 +32,10 @@
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2020.07"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2020.10"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="mx6cuboxi"
+BR2_TARGET_UBOOT_NEEDS_PYTHON3=y
+BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
 BR2_TARGET_UBOOT_FORMAT_IMG=y
 BR2_TARGET_UBOOT_SPL=y
 BR2_TARGET_UBOOT_SPL_NAME="SPL"