Bump cryptography from 41.0.3 to 42.0.4

Bumps [cryptography](https://github.com/pyca/cryptography) from 41.0.3 to 42.0.4.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@41.0.3...42.0.4)

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

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

setup.py

@@ -32,7 +32,7 @@
     # Newer versions require a Rust compiler to build, see
     # * https://github.com/openstack-charmers/zaza/issues/421
     # * https://mail.python.org/pipermail/cryptography-dev/2021-January/001003.html
-    'cryptography<3.4',
+    'cryptography<42.1',
 
     'hvac<0.7.0',
     'jinja2',