[deps] Updated requirements

requirements.txt

@@ -1,12 +1,8 @@
-# TODO: put back the standard pypi release when
-# next point version of openwisp-controller is released
-openwisp-controller @ https://github.com/openwisp/openwisp-controller/tarball/issues/471-snmp-connections
-# openwisp-utils[rest] is left unpinned so the version used
-# is the one dictated by openwisp-controller
-influxdb~=5.3
-django-celery-email~=3.0.0
+openwisp-controller @ https://github.com/openwisp/openwisp-controller/tarball/master
+influxdb~=5.3.1
 django-cache-memoize~=0.1.0
 django-nested-admin~=3.4.0
 netaddr~=0.8
 python-dateutil>=2.7,<3.0
+openwisp-utils[rest] @ https://github.com/openwisp/openwisp-utils/tarball/master
 netengine @ https://github.com/openwisp/netengine/tarball/netjson-compliance