Bump cryptography from 3.4.8 to 41.0.4 in /docs

Bumps [cryptography](https://github.com/pyca/cryptography) from 3.4.8 to 41.0.4.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@3.4.8...41.0.4)

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

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

docs/requirements.txt

@@ -21,7 +21,7 @@ charset-normalizer==2.0.1
 click==8.0.1
 colorama==0.4.4
 coverage==5.5
-cryptography==3.4.8
+cryptography==41.0.4
 cycler==0.10.0
 distlib==0.3.2
 dnspython==1.16.0