Migrate jsonschema go library

Today we use `github.com/alecthomas/jsonschema` to generate our jsonschema, however, that repo has been moved to `github.com/invopop/jsonschema`. We should migrate to using the latest library, however, initial testing shows that the json schema is very different than the schemas generated in the past. We should check that these differences have no impact when replacing this library.

Start by comparing schemas generated with github.com/alecthomas/jsonschema and github.com/invopop/jsonschema, then determine whether the differences affect Syft's existing schema output. Done means the library is migrated and the compatibility impact of the changed schemas has been checked.

Written by the indexing model from the issue text.