chore(deps): bump cryptography from 42.0.5 to 43.0.1 in /backend

Bumps [cryptography](https://github.com/pyca/cryptography) from 42.0.5 to 43.0.1.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@42.0.5...43.0.1)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

backend/requirements.txt

@@ -3,7 +3,7 @@ structlog==24.1.0
 django-structlog==8.1.0
 celery==5.3.6
 checksumdir==1.2.0
-cryptography==42.0.5
+cryptography==43.0.1
 django-cors-headers==4.4.0
 djangorestframework==3.15.2
 djangorestframework-simplejwt==5.2.2