Upgrade edx-enterprise package to 0.55.4.

https://github.com/edx/edx-enterprise/compare/0.55.1...0.55.4

requirements/edx/base.txt

@@ -49,7 +49,7 @@ git+https://github.com/cpennington/pylint-django@fix-field-inference-during-monk
 enum34==1.1.6
 edx-django-oauth2-provider==1.2.5
 edx-django-sites-extensions==2.3.0
-edx-enterprise==0.55.1
+edx-enterprise==0.55.4
 edx-oauth2-provider==1.2.2
 edx-opaque-keys==0.4.0
 edx-organizations==0.4.8