Ensure that PURLs are sorted according to their version scheme with univers

https://github.com/aboutcode-data/purls-swift-0000/commit/4596e324934d2fcd36d7ff5b47166a18e5342b5c#diff-1249f7741d9f8a759afbce2c2c5611a910028e0bbc642f03fd0a5384788705b2L185 shows we are not sorting using the proper scheme.