Bump wat from 1.215.0 to 1.216.0 in /native/wasmex (#628)

Bumps [wat](https://github.com/bytecodealliance/wasm-tools) from 1.215.0 to 1.216.0.
- [Release notes](https://github.com/bytecodealliance/wasm-tools/releases)
- [Commits](bytecodealliance/wasm-tools@v1.215.0...v1.216.0)

---
updated-dependencies:
- dependency-name: wat
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

native/wasmex/Cargo.toml

@@ -22,4 +22,4 @@ wasmtime = "24.0.0"
 wasmtime-wasi = "24.0.0"
 wasi-common = "24.0.0"
 wiggle = "24.0.0"
-wat = "1.215.0"
+wat = "1.216.0"