Bump parity-wasm from 0.42.1 to 0.42.2 (#222)

Bumps [parity-wasm](https://github.com/paritytech/parity-wasm) from 0.42.1 to 0.42.2.
- [Release notes](https://github.com/paritytech/parity-wasm/releases)
- [Commits](https://github.com/paritytech/parity-wasm/commits/v0.42.2

)

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