Bump django-markdownify from 0.9.5 to 0.9.7 in /backend

Bumps [django-markdownify](https://github.com/erwinmatijsen/django-markdownify) from 0.9.5 to 0.9.7.
- [Commits](erwinmatijsen/django-markdownify@0.9.5...0.9.7)

---
updated-dependencies:
- dependency-name: django-markdownify
  dependency-version: 0.9.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/pyproject.toml

@@ -72,7 +72,7 @@ dependencies = [
     "Werkzeug>=1.0.1,<4.0.0",
     "django-import-export<4.0.0,>=3.2.0",
     "dal-admin-filters==1.1.0",
-    "django-markdownify==0.9.5",
+    "django-markdownify==0.9.7",
     "django-imagekit==5.0.0",
     "pillow==10.4.0",
     "redis[hiredis]==5.0.2",