Bump cryptography to 3.4.7

Author: alexrudd2

requirements.txt

@@ -59,7 +59,7 @@ soupsieve==2.2.1;python_version>="3.6"
 beautifulsoup4==4.9.3
 cryptography==2.9.2;python_version<"3.5"
 cryptography==3.0;python_version>="3.5" and python_version<"3.6"
-cryptography==3.3.2;python_version>="3.6"
+cryptography==3.4.7;python_version>="3.6"
 pyopenssl==19.1.0;python_version<"3.6"
 pyopenssl==20.0.1;python_version>="3.6"
 pygments==2.5.2;python_version<"3.5"