Fix: use --release 8 for Java compatibility with newer JDKs

[sajadzirak]

Hello,

I was working with your project and ran into a small issue in Testcase10. In the action_update script, when compiling the code, you might encounter the following error:

JavaResize.java:23: error: package javax.xml.bind does not exist

After investigating, I found that this occurs because javax.xml.bind was deprecated and removed with Java 9.

I've proposed a small change to the script to include --release 8 so that the compilation works correctly on modern JDKs.

Thanks again for the great project!