Bump cryptography from 41.0.6 to 42.0.4 in /Demos (#243)

Bumps [cryptography](https://github.com/pyca/cryptography) from 41.0.6 to 42.0.4.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@41.0.6...42.0.4)

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

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