[JENKINS-42744] - Update WinSW to 2.0.3 and Windows Agent installer to 1.8
This PR updates WinSW to 2.0.3 in order to fix [JENKINS-42744](https://issues.jenkins-ci.org/browse/JENKINS-42744), which is reported as a critical regression in Jenkins 2.50. Changelog: https://github.com/kohsuke/winsw/blob/master/CHANGELOG.md#203 Full diff: https://github.com/kohsuke/winsw/compare/winsw-2.0.2...winsw-2.0.3
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