🚨(backend) fix linting issue

Fix linting issue in the backend codebase.

src/backend/core/models.py

@@ -11,8 +11,8 @@
 from django.db import models
 from django.template.base import Template as DjangoTemplate
 from django.template.context import Context
-from django.utils.html import format_html
 from django.utils.functional import lazy
+from django.utils.html import format_html
 from django.utils.translation import gettext_lazy as _
 
 import frontmatter

src/backend/demo/management/commands/create_demo.py

@@ -137,7 +137,7 @@ def create_demo(stdout):
     <div class="body">{{ body }}</div>
   </div>
 </page>
-""",         
+""",
                 css="""
 body {
   background: white; 
@@ -207,7 +207,7 @@ def create_demo(stdout):
   text-align: justify;
   ligne-height: 0.8;
 }
-""",       
+""",
                 is_public=True,
             )
         )

src/backend/demo/tests/test_commands_create_demo.py

@@ -9,8 +9,6 @@
 
 from core import models
 
-
-
 pytestmark = pytest.mark.django_db
 
 

src/backend/impress/settings.py

@@ -500,7 +500,7 @@ class Production(Base):
     #
     # In other cases, you should comment the following line to avoid security issues.
     # SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
-    SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
+    SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
 
     # Modern browsers require to have the `secure` attribute on cookies with `Samesite=none`
     CSRF_COOKIE_SECURE = True