Bump rdf-namespaces from 1.12.0 to 1.13.1

Bumps [rdf-namespaces](https://gitlab.com/vincenttunru/rdf-namespaces) from 1.12.0 to 1.13.1.
- [Changelog](https://gitlab.com/vincenttunru/rdf-namespaces/blob/master/CHANGELOG.md)
- [Commits](https://gitlab.com/vincenttunru/rdf-namespaces/compare/v1.12.0...v1.13.1)

---
updated-dependencies:
- dependency-name: rdf-namespaces
  dependency-version: 1.13.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]