[JENKINS-50439] Pick-up executable-war 1.39

[batmat]

Picking-up jenkinsci/extras-executable-war#16

See JENKINS-50439.

• Changelog: https://github.com/jenkinsci/extras-executable-war/blob/master/CHANGELOG.md#139
• Full diff: jenkinsci/extras-executable-war@executable-war-1.38...executable-war-1.39

Proposed changelog entries

• JENKINS-50439 remove the always present warning Failed to delete the temporary Winstone file /tmp/winstone/jenkins-2.112.war when the file is already absent

Submitter checklist

• JIRA issue is well described
• Changelog entry appropriate for the audience affected by the change (users or developer, depending on the change). Examples
  * Use the Internal: prefix if the change has no user-visible impact (API, test frameworks, etc.)
• Appropriate autotests or explanation to why this change has no tests
• For dependency updates: links to external changelogs and, if possible, full diffs

Desired reviewers

@reviewbybees

[oleg-nenashev]

Please also reference the full diff and changelog.
Example: #3336

[batmat]

Done.

[oleg-nenashev]

🐝 and @reviewbybees done