Bump testsuite/rdf-star from `44eaa13` to `c6b5f8c`

[dependabot[bot]]

Bumps testsuite/rdf-star from 44eaa13 to c6b5f8c.

Commits

• c6b5f8c fix broken link for Ruby Turtle
• 6a5b425 make link to impl report similar to RubyRDF
• 9ed22ce add Oxigraph in implementation page
• 7054913 Improve the presentation of function defns
• 744f90f Reword description of sparql-compare
• 1cb144b Apply suggestions from review
• ec39a47 GH-265: Clarify ORDER BY for SPARQL-star.
• 08e2710 GH-264: Reword definition of sparql-compare.
• 5dcb7d1 GH-263: Fix declared return type of sparql-compare
• See full diff in compare view

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