[Jenkins Public Infra] jdk21 migration for runtime java on all controllers

[Stéphane MERLE]

Hello dear Jenkins contributors,

The jenkins infra-team will perform an upgrade to jdk21 for runtime java for our controllers (and corresponding agents) starting today at 5PM UTC, this should take an hour. 

See epic https://github.com/jenkins-infra/helpdesk/issues/4120 

and https://status.jenkins.io

For the Jenkins Infra team,
Stéphane MERLE

[Stéphane MERLE]

Hello,

the operation finished with success, see https://github.com/jenkins-infra/helpdesk/issues/4121#issuecomment-2890355054 for details

For the Jenkins Infra team,
Stéphane MERLE