Update Epsilon tools

[szschaler]

Hi Steffen,

We noticed yesterday that this EOL program was failing to run from the Docker images we ship for the Playground and the Epsilon MDENet EP tools:

var x = Sequence {1..20}; 
x.subList(1, 5).subList(1, 3).println();

This was due to Java not opening nested classes in the java.util package for reflection by default from Java 15 onwards.

We have tweaked the Java flags used in those Docker images and now it works fine. These changes should show up in the 0.3 tags and the ones that only mention the Epsilon version (epsilon2.5, epsilon2.6, epsilon2.8).

Best,
Antonio