Bump @rails/ujs from 6.0.2 to 6.0.3 (#13730)

Bumps [@rails/ujs](https://github.com/rails/rails) from 6.0.2 to 6.0.3.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](https://github.com/rails/rails/compare/v6.0.2...v6.0.3

)

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