Freeze python dependencies at known working versions

Added undocumented dependencies as well.

requirements/common.txt

@@ -1,16 +1,20 @@
-apscheduler>=3.7.0
-argon2-cffi>=20.1.0
-email-validator>=1.1.2
-flask-multistatic>=1.0
-flask-wtf>=0.14.3
+apscheduler==3.7.0
+argon2-cffi==20.1.0
+email-validator==1.1.2
+flask-multistatic==1.0
+flask-wtf==0.14.3
 flask==1.1.2
-libsass>=0.20.1
-logging_prometheus>=0.1.0
-lxml>=4.6.2
-mysqlclient>=2.0.3
-prometheus-flask-exporter>=0.18.1
-pyop>=3.2.0
-pyjwkest>=1.4.2
-requests>=2.25.1
+libsass==0.20.1
+logging_prometheus==0.1.0
+lxml==5.2.1
+mysqlclient==2.0.3
+prometheus-flask-exporter==0.18.1
+pyop==3.2.0
+pyjwkest==1.4.2
+requests==2.25.1
 SQLAlchemy==1.4.15
 markupsafe==2.0.1
+Jinja2==3.0.1
+itsdangerous==1.1.0
+Werkzeug==1.0.1
+pycups==1.9.73

requirements/production.txt

@@ -1,2 +1,2 @@
 -r common.txt
-gunicorn>=20.0.4
+gunicorn==20.1.0