Bump Python requirement django-admin-hstore-widget to 1.2.0

requirements.txt

 # -r ./base/requirements.txt
 
 bleach==5.0.1
-django-admin-hstore-widget==1.1.0
+django-admin-hstore-widget==1.2.0
 django-cors-headers==3.11.0
 django-enumfields==2.1.1
 django-rq==2.5.1