Update BC Libs, change default version to 2.x

[jtnord]

Testing done

None.

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[jglick]

OK?

[jglick]

For jenkinsci/mina-sshd-api-plugin#190 (comment)?

[jtnord]

For jenkinsci/mina-sshd-api-plugin#190 (comment)?

partly that - partly BC 1,x is not certified on anything above Java17. For java21/25 you should be using BC2.x which is now certified.

So rather than upgrade things independently just switch the default. which will make its way into j-t-h and then recent plugin-pom updates.