SPARK_V in download.sh is inconsistent, fixed now

Author: tribbloid

dev/CI/download.sh

@@ -2,7 +2,7 @@
 
 CRDIR="$(cd "`dirname "$0"`"; pwd)"
 
-SPARK_V="${SPARK_V:-3.5.7}"
+SPARK_V="${SPARK_V:-4.0.1}"
 
 SPARK_NAME="${SPARK:-spark-${SPARK_V}}"