fix: forms-flow-documents/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

forms-flow-documents/requirements.txt

@@ -21,7 +21,7 @@ certifi==2023.7.22
 cffi==1.16.0
 charset-normalizer==3.3.0
 click==8.1.7
-cryptography==41.0.7
+cryptography==42.0.0
 ecdsa==0.18.0
 flask-jwt-oidc==0.3.0
 flask-marshmallow==0.15.0