Test with explicit versions

requirements.txt

@@ -1,12 +1,12 @@
-chardet>=3.0.2,<4.0.0
-eventlet
-Jinja2>=2.11 # BSD License (3 clause)
-jsonschema!=2.5.0,<3.0.0,>=2.0.0 # MIT
+chardet==3.0.4
+eventlet==0.33.3
+Jinja2==3.1.2 # BSD License (3 clause)
+jsonschema==2.6.0 # MIT
 # networkx v2.6 does not support Python3.6.  Update networkx to match st2
-networkx>=2.5.1,<2.6
-python-dateutil
-PyYAML>=3.1.0,<6.0 # MIT
-six>=1.9.0
-stevedore>=1.3.0 # Apache-2.0
-ujson>=1.35 # BSD License
-yaql>=1.1.0 # Apache-2.0
+networkx==2.5.1
+python-dateutil==2.8.2
+PyYAML==5.4.1 # MIT
+six==1.16.0
+stevedore==5.1.0 # Apache-2.0
+ujson==5.8.0 # BSD License
+yaql==2.0.0 # Apache-2.0