About dialog still shows Java version as 17

[Abhinay Agarwal]

After #619 was merged, the 'about' dialogue still shows Java version as '17'. This version is fetched from pom.xml which was missed in last update.

Expected Behavior

Java version should be 20.

Current Behavior

Java version is 17

Steps to Reproduce

Install the latest early access release and check the Java version by going to "Help" -> "About Scene Builder"

Your Environment

Mac OS 13.2.1 (22D68)