Python dependency: Update cryptography requirement

Updates the requirements on [cryptography](https://github.com/pyca/cryptography) to permit the latest version.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@39.0.0...40.0.0)

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

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

requirements.txt

@@ -31,7 +31,7 @@ psycopg[c]==3.1.*
 python-dateutil==2.*
 SQLAlchemy==2.*
 bcrypt==4.0.*
-cryptography==39.0.*
+cryptography==40.0.*
 sshtunnel==0.*
 ldap3==2.*
 gssapi==1.8.*