Bump rails from 6.1.5.1 to 6.1.6 (#18372)

Bump rails from 6.1.5.1 to 6.1.6 (#18372)

Bumps [rails](https://github.com/rails/rails) from 6.1.5.1 to 6.1.6.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](https://github.com/rails/rails/compare/v6.1.5.1...v6.1.6)

---
updated-dependencies:
- dependency-name: rails
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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