Bump cryptography from 41.0.4 to 41.0.6 in /docs

Bumps [cryptography](https://github.com/pyca/cryptography) from 41.0.4 to 41.0.6.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@41.0.4...41.0.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -27,7 +27,7 @@ cloudpickle==2.0.0
 colorama==0.4.4
 command-not-found==0.3
 configobj==5.0.6
-cryptography==41.0.4
+cryptography==41.0.6
 cupshelpers==1.0
 cycler==0.11.0
 dbus-python==1.2.18