meson64: bump edge 6.17 -> 6.18

Author: rpardini

config/sources/families/include/meson64_common.inc

@@ -41,7 +41,7 @@ case $BRANCH in
 		declare -g KERNEL_MAJOR_MINOR="6.12"
 		;;
 	edge)
-		declare -g KERNEL_MAJOR_MINOR="6.17"
+		declare -g KERNEL_MAJOR_MINOR="6.18"
 		;;
 
 esac