update-upstream-sdk

Update the hs-temporal-sdk project against the upstream Rust core SDK (temporalio/sdk-core). Covers revision bumps, Rust compilation, C header regeneration via bindgen, Haskell FFI bridge updates, protobuf regeneration, SDK module propagation, and nix build verification across GHC versions. Use when updating, bumping, syncing, or upgrading the upstream Temporal SDK dependency.