chore(deps): refresh notification plugin lockfile to include changefile commit

**What**
- update `Cargo.lock` to move `tauri-plugin-notification` from `c0992031` to `45004aa0`

**Why**
- keep Threshold aligned with the latest `notification-actions-fix` branch state
- include the plugin `.changes` metadata commit in the pinned git reference for traceability

Author: ScottMorris