Mk/bsd.default-versions.mk: bump java default to 21HEADmain

After an extensive time of testing OpenJDK 21 LTS is now the default
java version on FreeBSD.
Some major ports already used Java 21 and some olders ports are now
pinned to OpenJDK 8 or other versions.

For armv6/armv7 OpenJDK 11 is the latest version with support
for these platforms on FreeBSD.

Thanks to everybody involved in making Java a vivid environment on
FreeBSD.

PR:	272855
Relnotes:	yes

0 files changed, 0 insertions, 0 deletions