Fix rust overlay snapshot hash

[andersaamodt]

Summary

• update the oxalica rust-overlay snapshot hash so the pinned toolchain can be fetched during the standalone build

Testing

• cargo test --locked

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https://chatgpt.com/codex/tasks/task_e_68dbab15e71c8320a748455d60820d9b

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

[P1] Provide cargoHash so the Nix build can vendor dependencies

The new nix/standalone.nix derivation invokes rustPlatform.buildRustPackage with a Cargo.lock but no cargoHash (or cargoSha256). buildRustPackage requires the hash of the vendored cargo dependencies; without it nix-build nix/standalone.nix fails at evaluation with “attribute ‘cargoHash’ missing” and the “Build NixOS standalone binary” step in the workflow will always error. Add the correct cargo hash to allow the standalone build to succeed.

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