Use Jenkins 2.361 LTS

[offa]

Update to 2.361 LTS (context).

⚠️ The Jenkinsfile needs an update by someone with write permission, eg. using the example.

---

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[offa]

ping @timbrown5

I have updated the PR to the current recommended version (2.361.4).

[offa]

Superseded by #83.