✏️(backend) fix minor typo

login is a noun, the verb needs a whitespace.

src/backend/core/models.py

@@ -141,7 +141,7 @@ class User(AbstractBaseUser, BaseModel, auth_models.PermissionsMixin):
     email = models.EmailField(_("identity email address"), blank=True, null=True)
 
     # Unlike the "email" field which stores the email coming from the OIDC token, this field
-    # stores the email used by staff users to login to the admin site
+    # stores the email used by staff users to log in to the admin site
     admin_email = models.EmailField(
         _("admin email address"), unique=True, blank=True, null=True
     )