v0.17.3: fix scsi_recovery.rs Linux compile (missing Duration import)

tests/scsi_recovery.rs:
- Add `use std::time::Duration` inside both `#[cfg(target_os = "linux")]`
  blocks. Locally on macOS the linux blocks are cfg-out so the missing
  import was invisible to precommit on macOS.
- Bug pre-dated this branch but only surfaced when v0.17.2 release CI
  ran the test compile on Linux.

Cargo.toml: 0.17.2 -> 0.17.3.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libfreemkv"
-version = "0.17.2"
+version = "0.17.3"
 edition = "2024"
 rust-version = "1.86"
 license = "AGPL-3.0-only"