Bump es6-weak-map from 2.0.2 to 2.0.3 (#13621)

Bumps [es6-weak-map](https://github.com/medikoo/es6-weak-map) from 2.0.2 to 2.0.3.
- [Release notes](https://github.com/medikoo/es6-weak-map/releases)
- [Changelog](https://github.com/medikoo/es6-weak-map/blob/master/CHANGELOG.md)
- [Commits](https://github.com/medikoo/es6-weak-map/compare/v2.0.2...v2.0.3

)

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