fix(deps): align wasmtime-wasi to v43 to match wasmtime

[Brian Krabach (bkrabach)]

Summary

Fixes the Rust Core CI failure on every PR (and silently on main) caused by a wasmtime version mismatch.

Root cause

wasmtime was bumped to v43 (via dependabot in #74) but wasmtime-wasi remained pinned at v42. The two crates pulled in incompatible versions of wasmtime transitively, so wasmtime_wasi::p2::add_to_linker_sync(&mut linker) failed to type-check because the Linker<T> types came from different wasmtime versions.

error[E0308]: mismatched types
   --> crates/amplifier-core/src/bridges/wasm_tool.rs:66:43
    |
 66 |     wasmtime_wasi::p2::add_to_linker_sync(&mut linker)?;
    |     ----------------------------------- ^^^^^^^^^^^ expected `&mut Linker<_>`, found `&mut Linker<WasmState>`
    |     |
    |     arguments to this function are incorrect
    |
note: there are multiple different versions of crate `wasmtime` in the dependency graph
   --> wasmtime-42.0.1/src/runtime/component/linker.rs:61:1
   ::: wasmtime-43.0.2/src/runtime/component/linker.rs:61:1

Fix

One-line bump of wasmtime-wasi from "42" to "43" in crates/amplifier-core/Cargo.toml. Both crates now resolve to 43.0.2 cleanly.

Verification

All four Rust Core CI commands run locally:

Step	Result
cargo check -p amplifier-core --features wasm	✓
cargo check -p amplifier-core -p amplifier-core-py	✓
cargo test -p amplifier-core --no-run	✓
cargo fmt -p amplifier-core -p amplifier-core-py --check	✓
cargo clippy -p amplifier-core -p amplifier-core-py -- -D warnings	✓

Notes

• Workflow trigger config in .github/workflows/rust-core-ci.yml is on: pull_request: [main, rust-core] — does NOT run on push to main. That's why main went red silently. Worth a separate follow-up to add push: [main] so future regressions are caught immediately.