fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-CRYPTOGRAPHY-6592767

requirements.txt

@@ -33,7 +33,7 @@ constantly==15.1.0
 coreapi==2.3.3
 coreschema==0.0.4
 cron-descriptor==1.4.0
-cryptography==42.0.4
+cryptography==42.0.6
 cssselect==1.2.0
 cymem==2.0.7
 daphne==4.0.0