fix JavaSieve ci-validate because it uses too old gradle

Author: ktoso

Samples/JavaSieve/ci-validate.sh

@@ -3,7 +3,8 @@
 echo "Prepare the dependency..."
 git clone https://github.com/gazman-sdk/quadratic-sieve-Java
 cd quadratic-sieve-Java || exit
-sh ./gradlew jar
+# we use the root gradlew since this project uses ancient gradle that won't support our recent JDK in CI
+sh ../../gradlew jar
 cd .. || exit
 
 echo "Run the sample..."