fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-CRYPTOGRAPHY-7161587

requirements.txt

@@ -36,7 +36,7 @@ mysqlclient==2.1.1
 openpyxl==3.1.2
 Pillow==10.3.0  # required by django-imagekit
 psycopg2-binary==2.9.9
-cryptography==42.0.7
+cryptography==42.0.8
 python-dateutil==2.9.0.post0
 pytz==2024.1
 redis==5.0.4