Bump mocha from 8.4.0 to 9.0.0 in /js

Bumps [mocha](https://github.com/mochajs/mocha) from 8.4.0 to 9.0.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v8.4.0...v9.0.0)

---
updated-dependencies:
- dependency-name: mocha
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

js/package.json

@@ -3,7 +3,7 @@
   "description": "Oxigraph JS build and tests",
   "private": true,
   "devDependencies": {
-    "mocha": "^8.0.1",
+    "mocha": "^9.0.0",
     "@rdfjs/data-model": "1.1.2",
     "standard": "^16.0.0"
   },