Update java image

[bmesuere]

This pull request updates the java image to

• use a different base container since the old one is deprecated
• switches to heredoc syntax

This hopefully also fixes building an arm64 version of this image.

[bmesuere]

This image doesn't work: :(

java.lang.InternalError: Could not create SecurityManager: allow
	at sun.misc.Launcher.<init>(Launcher.java:106)
	at sun.misc.Launcher.<clinit>(Launcher.java:54)
	at java.lang.ClassLoader.initSystemClassLoader(ClassLoader.java:1444)
	at java.lang.ClassLoader.getSystemClassLoader(ClassLoader.java:1429)

[bmesuere]

@rien does this error sound familiar to you?

[bmesuere]

The error might be because naos has an incorrect java-judge set.
However, instead of fixing this, we will probably stop offering this judge and image instead. It has been deprecated for a few years already and there is only 1 user left.