fix(deps): bump cryptography to 50.0.0 (CVE-2026-69247, HIGH)

[seonghobae]

The org trivy-fs gate fails every open PR on this repo:

[HIGH (security-severity=8.0)] CVE-2026-69247 requirements.txt:125 - Package: cryptography

CVE-2026-69247: PKCS#7 EnvelopedData decryption exposes a Bleichenbacher oracle through distinguishable errors and timing. Vulnerable: >=44.0.0 <50.0.0; patched: 50.0.0.

Bumps cryptography 49.0.0 → 50.0.0 with hash pins refreshed from PyPI (46 artifacts, sorted). The existing cffi==2.1.0 pin satisfies cryptography 50's new cffi>=2.0.0 requirement, so no other pins change.

Unblocks #42 and every other open PR on this repo (trivy-fs gate). Note: the Semgrep gate has separate pre-existing code findings (authz.py, graph_store.py) tracked separately.

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• requirements.txt

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[seonghobae]

Closing as superseded by #50. PR #50 contains the same cryptography 50.0.0 CVE remediation and consolidates the accompanying exact-head security gates, JWKS transport fix, regression coverage, authoritative lock regeneration, and 100% statement/branch coverage enforcement. Consolidation prevents parallel lockfile branches and stale-head validation.