Bump dotenv-rails from 2.7.2 to 2.7.4 (#11170)

Bumps [dotenv-rails](https://github.com/bkeepers/dotenv) from 2.7.2 to 2.7.4.
- [Release notes](https://github.com/bkeepers/dotenv/releases)
- [Changelog](https://github.com/bkeepers/dotenv/blob/master/Changelog.md)
- [Commits](https://github.com/bkeepers/dotenv/compare/v2.7.2...v2.7.4

)

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