Bump cryptography from 37.0.4 to 39.0.1 in /server (#209)

Bumps [cryptography](https://github.com/pyca/cryptography) from 37.0.4 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@37.0.4...39.0.1)

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

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Author: dependabot[bot]

server/requirements.txt

@@ -12,7 +12,7 @@ coreapi
 coreschema
 coverage
 crashtest==0.3.1
-cryptography==37.0.4
+cryptography==39.0.1
 defusedxml
 distlib==0.3.4
 Django