Bump rails from 6.1.3 to 6.1.3.1 (#15960)

Bumps [rails](https://github.com/rails/rails) from 6.1.3 to 6.1.3.1.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](https://github.com/rails/rails/compare/v6.1.3...v6.1.3.1

)

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