[main-lts] Fix #1087 - Paths file when generating Java files on Windows

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Backport: #1190

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Fix #1047

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This fixes issues with generating openapi spec 3.1.0 versions on Windows, e.g. #1047

Please backport this to the main LTS release as well - I don't seem to be able to set a label?
I've tested this on my own simple project.

https://github.com/jcjveraa/quarkus-openapi-generator-demoapp

Without this fix (on windows on version 2.10.0-lts): java.net.URISyntaxException: Illegal character in opaque part at index 2: C:(...)
With (on local build of 3.0.0-SNAPSHOT): it works fine.

No tests added

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