kache 0.17.0

Zero-copy, content-addressed build cache for Rust, C/C++ and more, with S3 and shared-filesystem remotes.
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## Summary

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## Test plan

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- [ ]

## Checklist

- [ ] `just pr` passes locally (fmt + clippy + tests + changed-line mutants)
- [ ] New behaviour is covered by tests where it makes sense
- [ ] Commit messages follow [conventional commits](https://www.conventionalcommits.org/) (`feat:`, `fix:`, `docs:`, …)
- [ ] User-visible changes (CLI, config, output) are reflected in the README or relevant docs