Bump testsuite/rdf-star from `30ac58a` to `4481d7b`

Bumps [testsuite/rdf-star](https://github.com/w3c/rdf-star) from `30ac58a` to `4481d7b`.
- [Release notes](https://github.com/w3c/rdf-star/releases)
- [Commits](30ac58a9a2...4481d7b5b7)

---
updated-dependencies:
- dependency-name: testsuite/rdf-star
  dependency-type: direct:production
...

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

testsuite/rdf-star

@@ -1 +1 @@
-Subproject commit 30ac58a9a2717451242e06ec0ea241b72490183b
+Subproject commit 4481d7b5b7dd473b443e4f986f77ce38655b74d4