fix: Maven wrapper relative distributionUrl does not work (fixes #272)

[danishcake]

… on Windows

There is a Path -> URI -> Path roundtrip which was being incorrectly carried out. For Windows file URIs like

file:///C:/test

calling distUrl.getPath() resulted in /C:/test, which Paths.get could not handle. Existing behaviour is preserved for non-file URIs

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[jira-importer]

Resolve #272

[jira-importer]

Resolve #272

[github-actions]

@elharo Please assign appropriate label to PR according to the type of change.