Bump cryptography from 3.4.7 to 39.0.1 (#310)

Bumps [cryptography](https://github.com/pyca/cryptography) from 3.4.7 to 39.0.1.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@3.4.7...39.0.1)

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

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requirements-dev.txt

@@ -2,7 +2,7 @@ PyYAML==5.4.1
 cov-core==1.15.0
 coverage==5.5
 coveralls==1.5.1
-cryptography==3.4.7
+cryptography==39.0.1
 docopt==0.6.2
 pytest==6.2.3
 pytest-cov==2.11.1