fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-CRYPTOGRAPHY-15263096

Author: snyk-bot

requirements.txt

@@ -6,7 +6,7 @@ cffi==1.14.0
 click==7.1.2
 confuse==1.3.0
 coverage==5.1
-cryptography==3.3.2
+cryptography==46.0.5
 csvmapper==0.7
 Flask==1.1.2
 flask-swagger-ui==3.25.0