Building opensource COBOL 4J on Windows fails in GitHub Actions

[yutaro-sakamoto]

Building opensource COBOL 4J on Windows fails on GitHub Actions.
https://github.com/opensourcecobol/opensourcecobol4j/actions/runs/17667387360/job/50211518627
This may be caused by the upgrade of GitHub runners labeld with windows-latest.
https://github.blog/changelog/2025-07-31-github-actions-new-apis-and-windows-latest-migration-notice/