Bump cryptography from 42.0.2 to 42.0.4 (#8)

Bumps [cryptography](https://github.com/pyca/cryptography) from 42.0.2 to 42.0.4.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@42.0.2...42.0.4)

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

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requirements.txt

@@ -2,7 +2,7 @@ aiofiles==0.7.0
 aiosqlite==0.17.0
 asyncua==0.9.96
 cffi==1.14.5
-cryptography==42.0.2
+cryptography==42.0.4
 pycparser==2.20
 python-dateutil==2.8.1
 pytz==2021.1