Re-pin keep v0.7.4 (OPRF unlock holder failover)

[kwsantiago]

Re-pin the keep input from v0.7.3 to v0.7.4.

v0.7.4 adds in-attempt holder failover to the threshold-OPRF boot-unlock (privkeyio/keep#738): when a sampled holder is momentarily unreachable, the box excludes it and re-samples another eligible holder within the same unlock instead of failing the boot closed. This directly hardens the multi-geo / flaky-remote-holder case that the oprf-gate and oprf-unlock VM tests exercise.

Lock updated to rev 2ad42c5 (tag v0.7.4). No keep-node source change.

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 658d6e94-3fe6-4bd8-bb8d-55d1977d1443

📥 Commits

Reviewing files that changed from the base of the PR and between 8612665 and f409233.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• flake.nix

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch repin-keep-v0.7.4

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