Build(deps): bump vsss-rs from 5.4.0 to 6.0.1

[dependabot]

Bumps vsss-rs from 5.4.0 to 6.0.1.

Changelog

Sourced from vsss-rs's changelog.

Changelog

6.0.0 - 2026-07-30

• Added iterator-based APIs alongside the existing slice-based methods for Shamir, Feldman, Pedersen, and share-set workflows.
• Added an optional stream feature for asynchronous participant-identifier splitting and exact-count share combination.
• Added shorter API aliases for common split, combine, polynomial, verifier, and share-set operations while keeping the older method names available.
• Added in-place helpers for polynomial evaluation and share combining to support lower-allocation no_std use cases.
• Added BoxedUint share element support when bigint and alloc/std are enabled.
• Split curve-backed APIs behind the curve and curve-serde features so GF(16)/GF(256)-only users can build with a much smaller normal dependency tree.
• Split random participant identifier generation behind random-participant-ids.
• Replaced the num meta-crate dependency with narrower num-bigint and num-traits dependencies.
• Updated CI coverage, documentation, and release checks for minimal feature combinations.

Commits

• 50e4fbb spelling and doc updates
• 78f7b82 release v6.0.0
• dc6fe0f add streams
• 672ef72 update README.md
• 15af592 fix outdated
• 12d6963 various cleanups before final release
• d68c120 cleanup the Cargo.toml
• 37f2d77 various API cleanup
• 2cd0930 expose more api internals
• 7b2ef8c remove old uint5, add boxeduint
• Additional commits viewable in compare view

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[kwsantiago]

Not viable yet. vsss-rs 6.x requires elliptic-curve 0.14, but the oprf feature reaches elliptic-curve 0.13 via voprf 0.5 -> k256 0.13, so this puts two majors in the tree and k256::Scalar stops satisfying vsss_rs::elliptic_curve::PrimeField. Verified with cargo check -p keep-core --features oprf.

Adopting 6.x needs k256 0.14, which needs voprf >= 0.6, and voprf has only published 0.6.0-pre.1. A pre-release crate does not belong in the LUKS unlock path.

#960 adds a dependabot ignore for vsss-rs majors with the reasoning recorded, so this stops being reopened weekly. Revisit when voprf 0.6 is stable and upgrade k256, voprf, and vsss-rs together.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.