Bump yargs-parser from 13.1.1 to 20.2.0 in /assets

Bumps [yargs-parser](https://github.com/yargs/yargs-parser) from 13.1.1 to 20.2.0.
- [Release notes](https://github.com/yargs/yargs-parser/releases)
- [Changelog](https://github.com/yargs/yargs-parser/blob/master/CHANGELOG.md)
- [Commits](yargs/yargs-parser@v13.1.1...v20.2.0)

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