Bump cryptography from 38.0.2 to 39.0.1 in /docs

Bumps [cryptography](https://github.com/pyca/cryptography) from 38.0.2 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@38.0.2...39.0.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements.txt

@@ -7,7 +7,7 @@ certifi==2022.12.7
 cffi==1.15.1
 charset-normalizer==2.1.1
 colorama==0.4.6
-cryptography==38.0.2
+cryptography==39.0.1
 docutils==0.17
 funcparserlib==1.0.1
 idna==3.4