Bump cryptography from 43.0.1 to 44.0.1 in /backend in the pip group (#861)

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


Updates `cryptography` from 43.0.1 to 44.0.1
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@43.0.1...44.0.1)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/requirements.txt

@@ -3,7 +3,7 @@ argon2-cffi==23.1.0
 argon2-cffi-bindings==21.2.0
 Babel==2.15.0
 caldav==1.3.9
-cryptography==43.0.1
+cryptography==44.0.1
 fastapi[standard]==0.115.4
 fluent.runtime==0.4.0
 fluent.syntax==0.19.0