build(deps): bump cryptography from 50.0.0 to 50.0.2 in /backend

[dependabot]

2026-10-01 canonical owner hold (authoritative)

• Exact partial head: a0cbfd417d22f90203ca2d06d48fc2d2ab3346a0.
• Canonical repository-wide dependency/security owner: fix(security): repair shared dependency scan failures #1828 fix/security-dependency-floor-20260930@74f9d6dd3b34d1179ca5f2aa3c5c294d22c7d2b2.
• This PR changes only a subset of shared manifests/locks and cannot independently clear the current repository-wide Security/Application CI gate.
• Status: Draft / Proposed. Preserve this delta as owner input; do not merge or copy it around fix(security): repair shared dependency scan failures #1828.

Bumps cryptography from 50.0.0 to 50.0.2.

Changelog

Sourced from cryptography's changelog.

50.0.2 - 2026-09-30

* Updated Windows, macOS, and Linux wheels to be compiled with OpenSSL 4.0.3.
* Added ``abi3.abi3t`` wheels for free-threaded CPython 3.15 and later.
* Updated to PyO3 0.29.2, which fixes building ``cryptography`` on Cygwin and
  MSYS2.
.. _v50-0-1:
50.0.1 - 2026-08-25

• Updated Windows, macOS, and Linux wheels to be compiled with OpenSSL 4.0.2.

.. _v50-0-0:

Commits

• 4dda5c7 [50.0.x] Bump for 50.0.2 release + changelog (#15733)
• 70c881c [50.0.x] Bump pyo3 to 0.29.2 (#15731)
• a8c45c4 [50.0.x] Build abi3.abi3t wheels for CPython 3.15+ (#15496) (#15732)
• ffde75a bump for 50.0.1 + changelog (#15520)
• See full diff in compare view

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