build(deps): bump @tpluscode/rdf-string from 1.3.0 to 1.3.1

Bumps [@tpluscode/rdf-string](https://github.com/tpluscode/rdf-string) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/tpluscode/rdf-string/releases)
- [Changelog](https://github.com/tpluscode/rdf-string/blob/master/CHANGELOG.md)
- [Commits](tpluscode/rdf-string@v1.3.0...v1.3.1)

---
updated-dependencies:
- dependency-name: "@tpluscode/rdf-string"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -18,7 +18,7 @@
     "url": "https://github.com/hypermedia-app/resource-store"
   },
   "dependencies": {
-    "@tpluscode/rdf-string": "^1.3.0",
+    "@tpluscode/rdf-string": "^1.3.1",
     "@tpluscode/sparql-builder": "^2.0.2",
     "@types/clownface": "^2.0.7",
     "@types/rdfjs__environment": "^1.0.0",