Fix Glassfish download URL of jenkinsfile

Since the URL specified in the current Jenkinsfile isn't permanent, I think it would be better to change it to the GitHub Release asset URL.

https://download.eclipse.org/ee4j/glassfish/glassfish-8.0.3.zip
↓
https://github.com/eclipse-ee4j/glassfish/releases/download/8.0.3/glassfish-8.0.3.zip

It is recommended that this fix be incorporated into the main krazo code as well.

ref)
https://www.eclipse.org/lists/glassfish-dev/msg01716.html

Start with the Jenkinsfile and compare its GlassFish 8.0.3 download URL with the GitHub Release asset URL given in the issue. Check the main Krazo code for the same reference, and consider the work done when both locations use the permanent release asset URL.

Written by the indexing model from the issue text.