fix(package.json): updating json webtoken to v9

[abod-akhras]

The package uses jsonwebtoken 8.5.1 which is deprecated now and having security issues therefore updating to the patched jsonwebtoken v9.0.0.

The new version requires a minimum of v12 Node.

fix https://github.com/ibm-cloud-security/appid-serversdk-nodejs/issues/286

[coveralls]

Coverage: 95.349%. Remained the same when pulling d39ef7d6ffca9e2ccf389da56fb82dcc9c0e40a1 on development into e634a543409b8352459dc1d5012dd58d0d1b3afa on master.

[github-actions[bot]]

:tada: This PR is included in version 6.3.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: