devel/jenkins-lts: Update the Java version requirement to 17+

As described in
https://www.jenkins.io/doc/book/platform-information/support-policy-java/

The order of commits is different on 2024Q4 branch compared to main.
That is why the PORTREVISION is bumped here.

PR: 282572
Reported by: Urs <urs.probst@triamec.com>
Approved by: broken port blanket (and previous mail about trivial changes)

(cherry picked from commit 187cccbda725a559adc146d861b3345be779162f)