java default to openjdk25 (soon)

Hi,

The issue to set the Java default to 25 is pretty easy and almost done.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293559

This mail is an heads-up message to make users aware of the change.

After the new quarterly 2026Q2 branch is created and my last ports fix is committed, then I want to set JAVA_DEFAULT=25 in Mk/bsd.default-versions.mk. This will only happen on the main branch. Hopefully this can happen on Thursday April 2th.
NB: i386 will stay at JAVA_DEFAULT=21 as openjdk25 upstream dropped support for i386.

Thank to the people involved in creating the openjdk25 port and the people testing and reviewing patches.

Regards,
Ronald.