Update dependency django-graphql-jwt to v0.3.1

Author: renovate-bot

{{ cookiecutter.project_slug }}/server/requirements.txt

@@ -7,7 +7,7 @@ django-cors-headers==3.2.1
 django-environ==0.4.5
 
 # GraphQL
-django-graphql-jwt==0.3.0
+django-graphql-jwt==0.3.1
 graphene-django==2.9.0
 
 # Technically graphene and graphql-core should not have to be specified here,