fix: leaktopus_backend/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-CRYPTOGRAPHY-6036192
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-6035177

leaktopus_backend/requirements.txt

@@ -2,7 +2,7 @@ jinja2<3.1.0
 Flask==1.1.2
 itsdangerous==2.0.1
 # Flask_Caching==1.9.0
-Werkzeug==1.0.1
+Werkzeug==3.0.1
 flask_debugtoolbar==0.11.0
 # flask_mail==0.9.1
 # flask_static_digest==0.2.1
@@ -28,7 +28,7 @@ elasticsearch==7.17.4
 GitPython
 truffleHog==2.2.1
 pyjwt>=2.4.0 # not directly required, pinned to avoid a vulnerability
-cryptography==39
+cryptography==41.0.5
 
 # Documentation libs
 flasgger==0.9.5