Bump simple_form from 5.0.3 to 5.1.0 (#15732)

Bumps [simple_form](https://github.com/plataformatec/simple_form) from 5.0.3 to 5.1.0.
- [Release notes](https://github.com/plataformatec/simple_form/releases)
- [Changelog](https://github.com/heartcombo/simple_form/blob/master/CHANGELOG.md)
- [Commits](https://github.com/plataformatec/simple_form/compare/v5.0.3...v5.1.0

)

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