Bump json-ld-preloaded from 3.0.4 to 3.0.6

Bumps [json-ld-preloaded](https://github.com/ruby-rdf/json-ld-preloaded) from 3.0.4 to 3.0.6.
- [Release notes](https://github.com/ruby-rdf/json-ld-preloaded/releases)
- [Commits](https://github.com/ruby-rdf/json-ld-preloaded/compare/3.0.4...3.0.6

)

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