build(deps): bump cryptography in /tools/visualize-pdr

Bumps [cryptography](https://github.com/pyca/cryptography) from 39.0.1 to 42.0.4.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@39.0.1...42.0.4)

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

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

Author: dependabot[bot]

tools/visualize-pdr/requirements.txt

@@ -2,7 +2,7 @@ graphviz==0.16
 tabulate==0.8.9
 bcrypt==3.2.0
 cffi==1.14.5
-cryptography==3.4.7
+cryptography==42.0.4
 paramiko==2.10.1
 pycparser==2.20
 pynacl==1.4.0