Add secure default SECURE REFERRER POLICY / Referrer-policy header Description

Add secure default SECURE REFERRER POLICY / Referrer-policy header Description: a task in Lego-RL-SWE-Bench-Verified (Harbor dataset). Repo: django/django Version: 3.1 Base commit: 7fa1a93c6c8109010a6ff3f604fda83b604e0e97 Instance ID: django django-12419

The task

**Repo:** `django/django` **Version:** `3.1` **Base commit:** `7fa1a93c6c8109010a6ff3f604fda83b604e0e97` **Instance ID:** `django__django-12419`

Part of Lego-X/Lego-RL-SWE-Bench-Verified.