Bump mocha from 5.2.0 to 8.0.1 in /js

Bumps [mocha](https://github.com/mochajs/mocha) from 5.2.0 to 8.0.1.
- [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/v5.2.0...v8.0.1)

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

js/package.json

@@ -3,7 +3,7 @@
   "description": "Build a tests for Oxigraph JS",
   "private": true,
   "devDependencies": {
-    "mocha": "^5.2.0",
+    "mocha": "^8.0.1",
     "@rdfjs/data-model": "^1.1.2"
   },
   "scripts": {