Bump @rdfjs/data-model from 1.1.2 to 1.2.0 in /js

Bumps [@rdfjs/data-model](https://github.com/rdfjs-base/data-model) from 1.1.2 to 1.2.0.
- [Release notes](https://github.com/rdfjs-base/data-model/releases)
- [Commits](https://github.com/rdfjs-base/data-model/compare/v1.1.2...v1.2.0)

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

js/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "devDependencies": {
     "mocha": "^8.0.1",
-    "@rdfjs/data-model": "1.1.2",
+    "@rdfjs/data-model": "1.2.0",
     "standard": "^14.3.4"
   },
   "scripts": {