fix(ruby): remove advisories from OSVDB

[knqyf263]

Overview

One of our data sources, ruby-advisory-db depends on advisories from OSVDB.
https://github.com/rubysec/ruby-advisory-db/blob/master/LICENSE.txt

But OSVDB doesn't allow commercial usage without agreement.

If the OSVDB is the basis of, or integrated with in any manner a commercially available product or service you MUST notify OSVDB by providing details on the usage and reach a licensing agreement prior to usage.

We already have some data sources for Ruby. We can remove those advisories so that Trivy can be used in commercials.

Implementation

Skip OSVDB here.
https://github.com/aquasecurity/trivy-db/blob/62aa4616130e5e27b1eb33bf65a2e6b44090fc43/pkg/vulnsrc/bundler/bundler.go

References

rubysec/ruby-advisory-db#487