Update cryptography package attempt 2

Change-Id: I33300f1cea584f2f539a015ed16ef42eb80c2b58

Pipfile

@@ -79,7 +79,7 @@ httpx = "*"  # for testing the agent-receiver
 
 [packages]
 setuptools_scm = "==4.1.2"  # needed by various setup.py
-six = "==1.16.0"  # direct dependency + needed by bcrypt, cryptography, PyNaCl, python-dateutil, vcrpy, python-active-directory
+six = "==1.16.0"  # direct dependency + needed by bcrypt, cryptography, python-dateutil, vcrpy, python-active-directory
 python-dateutil = "==2.8.2"  # direct dependency
 PyYAML = "==6.0.1"  # needed by vcrpy
 wrapt = "==1.14.1"  # needed by vcrpy
@@ -88,9 +88,8 @@ multidict = "==6.0.4"  # needed by yarl
 idna = "==3.4"  # needed by yarl
 vcrpy = "==4.2.1"  # used by various unit tests to mock HTTP transactions
 pycparser = "==2.21"  # needed by cffi
-cffi = "==1.15.1"  # needed by PyNaCl, cryptography, bcrypt
-PyNaCl = "==1.5.0"  # needed by paramiko
-cryptography = "==3.3.2"  # needed by paramiko. NOTE: rust is needed for version >=3.4, see https://cryptography.io/en/latest/changelog/#v3-4
+cffi = "==1.15.1"  # needed by cryptography, bcrypt
+cryptography = "~=3.4"  # needed by paramiko. NOTE: rust is needed for version >=3.4, see https://cryptography.io/en/latest/changelog/#v3-4
 bcrypt = "==3.2.2"  # needed by paramiko. NOTE: rust is needed for version >=4.0.0, see https://github.com/pyca/bcrypt#400
 paramiko = "==2.10.3"
 pyasn1 = "==0.4.8"  # needed by pysnmp