fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-CRYPTOGRAPHY-6050294
- https://snyk.io/vuln/SNYK-PYTHON-CRYPTOGRAPHY-6126975

requirements.txt

@@ -10,7 +10,7 @@ PyJWT==1.7.1
 gunicorn==19.9.0
 base32-crockford==0.3.0
 requests==2.22.0
-cryptography==3.3.2
+cryptography==42.0.0
 sevenbridges-python==0.24.0
 django-rq==2.3.2
 rq==1.6.1