Bump wasm-bindgen from 0.2.68 to 0.2.69 (#2044)

Bumps [wasm-bindgen](https://github.com/rustwasm/wasm-bindgen) from 0.2.68 to 0.2.69.
- [Release notes](https://github.com/rustwasm/wasm-bindgen/releases)
- [Changelog](https://github.com/rustwasm/wasm-bindgen/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rustwasm/wasm-bindgen/compare/0.2.68...0.2.69)

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