tox.ini: set psycopg2 constraint in all environments

tox.ini

@@ -92,7 +92,7 @@ setenv =
   DJANGO_SETTINGS_MODULE=authentic2.settings
   SETUPTOOLS_USE_DISTUTILS=stdlib
 deps =
-    psycopg2-binary
+    psycopg2-binary<2.9
 commands =
   ./getlasso3.sh
   ./check-migrations.sh
@@ -105,7 +105,7 @@ setenv =
 deps =
     pylint
     pylint-django
-    psycopg2-binary
+    psycopg2-binary<2.9
     django_webtest
     faker
     httmock
@@ -124,7 +124,7 @@ setenv =
   DJANGO_SETTINGS_MODULE=authentic2.settings
   AUTHENTIC2_SETTINGS_FILE=local_settings.py
 deps =
-  psycopg2-binary
+  psycopg2-binary<2.9
   django-debug-toolbar
   ipython
   ipdb
@@ -138,7 +138,7 @@ usedevelop = True
 setenv =
   DJANGO_SETTINGS_MODULE=authentic2.settings
 deps =
-  psycopg2-binary
+  psycopg2-binary<2.9
 commands =
     ./getlasso3.sh
     ./authentic2-ctl makemessages