Disable weekly build during 2 week end of year shutdown

[MarkEWaite]

Disable weekly build during 2 week end of year shutdown

Jenkins infra team will be off for the next two weeks. Let's not release plugin BOM during those two weeks.

Testing done

None. Rely on ci.jenkins.io to test.

Submitter checklist

• 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