chore(deps): bump cryptography (#322)

Bumps the pip group with 1 update in the /backend directory: [cryptography](https://github.com/pyca/cryptography).


Updates `cryptography` from 42.0.0 to 48.0.1
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@42.0.0...48.0.1)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-version: 48.0.1
  dependency-type: direct:production
...

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Author: dependabot[bot]

backend/requirements.txt

@@ -10,7 +10,7 @@ attrs==26.1.0
 certifi==2026.4.22
 charset-normalizer==3.4.7
 click==8.3.2
-cryptography==42.0.0
+cryptography==48.0.1
 fastapi==0.136.0
 frozenlist==1.8.0
 GeoAlchemy2==0.19.0