build(deps): bump hkdf from 0.12.3 to 0.12.4 in /backend

[dependabot[bot]]

Bumps hkdf from 0.12.3 to 0.12.4.

Commits

• 1ac16e8 hkdf: fix Debug impls (#90)
• 3023203 Update Cargo.lock
• 7d1baf4 Bump sha1 from 0.10.5 to 0.10.6 (#85)
• d2fbb24 Bump actions/checkout from 3 to 4 (#84)
• 9df5ac1 Update Clippy and fix lints (#83)
• 7753c7e Update Cargo.lock
• 2e3ba65 Bump digest from 0.10.6 to 0.10.7 (#81)
• 9471138 Replace unmaintained actions-rs/* actions in CI workflows (#79)
• 3b375ce hkdf: add salt recommendations to docs (#78)
• e48fc53 hkdf: switch from sha-1 to sha1 (#77)
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f130072) 38.92% compared to head (b7066b1) 38.92%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #634 +/- ## ======================================= Coverage 38.92% 38.92% ======================================= Files 57 57 Lines 3430 3430 ======================================= Hits 1335 1335 Misses 2095 2095 ```

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