Update dependency cryptography to v3.4.8

requirements.txt

@@ -2,7 +2,7 @@ certifi==2021.10.8
 cffi==1.14.6
 charset-normalizer==2.0.7
 click==8.0.1
-cryptography==3.4.7
+cryptography==3.4.8
 Flask==2.0.1
 Flask-Cors==3.0.10
 Flask-JWT-Extended==4.3.1