Reduce concurrent workers on Arm CI builds

.ci/scripts/run-gradle.sh

@@ -4,7 +4,7 @@
 rm -Rfv ~/.gradle/init.d
 mkdir -p ~/.gradle/init.d && cp -v $WORKSPACE/.ci/init.gradle ~/.gradle/init.d
 if [ "$(uname -m)" = "arm64" ] || [ "$(uname -m)" = "aarch64" ]; then
-   MAX_WORKERS=16
+   MAX_WORKERS=8
 elif [ -f /proc/cpuinfo ]; then
    MAX_WORKERS=`grep '^cpu\scores' /proc/cpuinfo  | uniq | sed 's/\s\+//g' |  cut -d':' -f 2`
 else