Pin versions

This pins versions to match what is being used in production.  Some
of these python dependencies may need updating.

Author: scanon

requirements.txt

@@ -1,8 +1,16 @@
-python-pam
+python-pam==1.8.4
 pymongo==3.12.1
-gunicorn
-flask
-pyyaml
-pyjwt
+gunicorn==20.1.0
+flask==2.0.2
+pyyaml==6.0
+pyjwt==2.3.0
 pyjwt[crypto]
-cryptography
+cryptography==36.0.1
+Werkzeug==2.0.2
+cffi==1.15.0
+click==8.0.3
+itsdangerous==2.0.1
+Jinja2==3.0.3
+MarkupSafe==2.0.1
+pycparser==2.21
+pymongo==3.12.1