mekotronics-r58s2: u-boot: bump from -rcX to 2026.04 (final)

Author: rpardini

config/boards/mekotronics-r58s2.conf

@@ -53,7 +53,7 @@ function post_family_config__meko_r58s2_use_mainline_uboot() {
 	declare -g BOOTCONFIG="mekotronics-r58s2-rk3588s_defconfig"
 	declare -g BOOTDELAY=1
 	declare -g BOOTSOURCE="https://github.com/u-boot/u-boot.git"
-	declare -g BOOTBRANCH="tag:v2026.04-rc2"
+	declare -g BOOTBRANCH="tag:v2026.04"
 	declare -g BOOTPATCHDIR="v2026.04"
 	declare -g BOOTDIR="u-boot-${BOARD}"