Update for express-jwt@7

[christianliebel]

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Description

Describe the purpose of this PR along with any background information and the impacts of the proposed change. For the benefit of the community, please do not assume prior context.

express-jwt in version 7 does no longer offer a default export. I updated the demo code according to the express-jwt docs: https://github.com/auth0/express-jwt#usage

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References

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Testing

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• [ ] This change adds test coverage for new/changed/fixed functionality

Checklist

• [ ] I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• [ ] All active GitHub checks for tests, formatting, and security are passing
• [ ] The correct base branch is being used, if not the default branch

[adamjmcgrath]

Thanks @christianliebel