Unable to checkout and build org-apache-sling-feature-cpconverter on Windows

it's currently not possible to work with the git repo on Windows:
https://github.com/apache/sling-org-apache-sling-feature-cpconverter

due to (on windows FS) illegal chars in file names:

error: invalid path 'src/test/resources/org/apache/sling/feature/cpconverter/handlers/jcr_root/rep:security/rep:authorizables/rep:groups/g/V084LLw1ypl2l9G0e28c/.content.xml'
fatal: unable to checkout working tree
warning: Clone succeeded, but checkout failed.

the test sources src/test/resources/org/apache/sling/feature/cpconverter/handlers seem to use filevault file layout, but in this case the folders/files names are not escaped properly.