Bump jsonwebtoken from 8.1.0 to 9.0.0 in /intro/server

Bumps [jsonwebtoken](https://github.com/auth0/node-jsonwebtoken) from 8.1.0 to 9.0.0.
- [Release notes](https://github.com/auth0/node-jsonwebtoken/releases)
- [Changelog](https://github.com/auth0/node-jsonwebtoken/blob/master/CHANGELOG.md)
- [Commits](https://github.com/auth0/node-jsonwebtoken/compare/v8.1.0...v9.0.0)

---
updated-dependencies:
- dependency-name: jsonwebtoken
  dependency-type: direct:production
...

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

intro/server/package.json

@@ -21,7 +21,7 @@
   },
   "dependencies": {
     "bcrypt-nodejs": "0.0.3",
-    "jsonwebtoken": "8.1.0",
+    "jsonwebtoken": "9.0.0",
     "lodash": "4.17.4",
     "moleculer": "^0.11.0",
     "moleculer-db": "0.7.0",