Bump rdf from 3.1.5 to 3.1.6 (#14736)
Bump rdf from 3.1.5 to 3.1.6 (#14736)

Bumps [rdf](https://github.com/ruby-rdf/rdf) from 3.1.5 to 3.1.6.
- [Release notes](https://github.com/ruby-rdf/rdf/releases)
- [Changelog](https://github.com/ruby-rdf/rdf/blob/develop/CHANGES.md)
- [Commits](https://github.com/ruby-rdf/rdf/compare/3.1.5...3.1.6)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
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