Bump SCALIBR version to 0.3.1 in preparation for a new release.

PiperOrigin-RevId: 781491225

Enable storing PURL-less packages in PackageIndex.

PiperOrigin-RevId: 770555219

Fix the podman extractor's metadata field and its deprecated Go import.

PiperOrigin-RevId: 761041686

Add PURLType field to Package and a central ToPURL function.

PiperOrigin-RevId: 750539621

Merge pull request #655 from cuixq:python

PiperOrigin-RevId: 744550781

Merge pull request #519 from ackama:refactor/remove-always-nil-errors

PiperOrigin-RevId: 736348246

Merge pull request #429 from another-rex:fix-sbom-extractors

PiperOrigin-RevId: 723433104

Fix invalid type matching in the `regosversion` extractor, causing pu…

…rl to not be generated.

PiperOrigin-RevId: 700283835

Merge pull request #265 from ackama:ci/use-matrix

PiperOrigin-RevId: 693647610

Add native support for php/composerlock extraction.

PiperOrigin-RevId: 676800059