[ADOPTION] Build Token Trigger plugin

[zerlinpi]

Hi,

I would like to adopt the Build Token Trigger plugin:

- Link: https://github.com/jenkinsci/build-token-trigger-plugin
- Status: for adoption
- GitHub username: zerlinpi
- Jenkins infrastructure ID: zerlinpi
- Repository Permission Updater PR: https://github.com/jenkins-infra/repository-permissions-updater/pull/5149
- Maintenance pull request: https://github.com/jenkinsci/build-token-trigger-plugin/pull/6
- Passing fork CI: https://github.com/zerlinpi/build-token-trigger-plugin/actions/runs/29266987430

I plan to restore the plugin's current Jenkins build, replace deprecated APIs,
add regression coverage, review incoming issues and pull requests, and publish
compatible releases. My first maintenance branch updates the Jenkins parent POM
and dependency baseline without intentionally changing user-facing behavior.
It passes mvn clean verify, including 12 tests, SpotBugs, and plugin packaging.

Best regards,
zerlinpi