Bump wasmtime-wasi from 19.0.0 to 20.0.0 in /rust

Bumps [wasmtime-wasi](https://github.com/bytecodealliance/wasmtime) from 19.0.0 to 20.0.0.
- [Release notes](https://github.com/bytecodealliance/wasmtime/releases)
- [Changelog](https://github.com/bytecodealliance/wasmtime/blob/main/docs/WASI-some-possible-changes.md)
- [Commits](bytecodealliance/wasmtime@v19.0.0...v20.0.0)

---
updated-dependencies:
- dependency-name: wasmtime-wasi
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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