🐛(helm) enable SSL when sending email

Email settings were wrongly configured. It led to unsent email and timeout
response from the backend server.

I forgot to enable the SSL while using the Email service from scalingo.

src/backend/people/settings.py

@@ -266,6 +266,7 @@ class Base(Configuration):
     EMAIL_HOST_PASSWORD = values.Value(None)
     EMAIL_PORT = values.PositiveIntegerValue(None)
     EMAIL_USE_TLS = values.BooleanValue(False)
+    EMAIL_USE_SSL = values.BooleanValue(False)
     EMAIL_FROM = values.Value("from@example.com")
 
     AUTH_USER_MODEL = "core.User"