fix: take reference of run cache opts · vercel/turborepo@0fbc54b

unused variable: `src_metadata`

`turborepo-fs` (lib) generated 1 warning (run `cargo fix --lib -p turborepo-fs` to apply 1 suggestion)

unused variable: `mode`

`turborepo-cache` (lib) generated 1 warning (run `cargo fix --lib -p turborepo-cache` to apply 1 suggestion)

unused import: `get_version`

variant `Exists` is never constructed

constant `WINDOWS_POLL_DURATION` is never used

variant `PathError` is never constructed

multiple fields are never read

`turborepo-lib` (lib) generated 5 warnings (run `cargo fix --lib -p turborepo-lib` to apply 1 suggestion)

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