Univers

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- Update link references of ownership from nexB to aboutcode-org. https://github.com/aboutcode-org/univers/issues/140

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- Support VersionRange normalization using known versions. https://github.com/nexB/univers/pull/108
- Fix the edge case resulting in incorrect ``contains`` resolution in VersionRange. https://github.com/nexB/univers/issues/137 https://github.com/nexB/univers/pull/108
- Use native impl to parse Maven and NuGet range expression in ``from_gitlab_native``. https://github.com/nexB/univers/issues/136 https://github.com/nexB/univers/pull/108
- Fix incorrect parsing of composer range in ``from_gitlab_native``. https://github.com/nexB/univers/issues/136 https://github.com/nexB/univers/pull/108

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- Use proper exception subclass for invalid constraints error.

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- Add Nix flake as a build system.
- Refactor gem and make nuget hashable.
- Update skeleton.
- Handle NoneType in VersionRange.from_string.
- Handle npm prerelease caret range expression.

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- Add support for conan version and version range.
- Fix version comparison for all the versions.

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- Fix unhashable error in GemVersion.