Bump wasmi from 0.28.0 to 0.29.0

Bumps [wasmi](https://github.com/paritytech/wasmi) from 0.28.0 to 0.29.0.
- [Release notes](https://github.com/paritytech/wasmi/releases)
- [Changelog](https://github.com/paritytech/wasmi/blob/master/CHANGELOG.md)
- [Commits](wasmi-labs/wasmi@v0.28.0...v0.29.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -15,7 +15,7 @@ route-recognizer = "0.3"
 scheduled-thread-pool = "0.2"
 simple_logger = "4.1.0"
 tiny_http = "0.12.0"
-wasmi = "0.28"
+wasmi = "0.29"
 wit-bindgen-wasmi = { git = "https://github.com/flavio/wit-bindgen.git", branch = "wasmi" }