Bump @rails/ujs from 6.1.1 to 6.1.2 (#15698)

Bumps [@rails/ujs](https://github.com/rails/rails) from 6.1.1 to 6.1.2.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](https://github.com/rails/rails/compare/v6.1.1...v6.1.2

)

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