Use the linter from osv (in addition to json schema)

[hannesm]

From @another-rex in google/osv.dev#4632 (comment)

If you want you can replace the jsonschema check with the linter here: https://github.com/ossf/osv-schema/tree/main/tools/osv-linter for a more comprehensive check.

This should be integrated into the workflow -- where we use the json schema for validation right now.