Use Jenkins 2.492.1 as bom-2.492.x base version

[jplayout]

Release checklist:

2.492.1 LTS Release checklist

Changelog:
https://www.jenkins.io/changelog-stable/2.492.1/

Upgrade guide:

https://www.jenkins.io/doc/upgrade-guide/2.492/

Testing done

None. Rely on ci.jenkins.io to perform all the checks.

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

[MarkEWaite]

Thanks!

Tested with:

LINE=2.492.x PLUGINS=structs,mailer TEST=InjectedTest bash local-test.sh

Confirmed that the 2.492.1 dependencies were downloaded instead of 2.492. Confirmed that the tests pass.