Bump sprockets-rails from 3.2.2 to 3.4.0 (#16990)

Bump sprockets-rails from 3.2.2 to 3.4.0 (#16990)

Bumps [sprockets-rails](https://github.com/rails/sprockets-rails) from 3.2.2 to 3.4.0.
- [Release notes](https://github.com/rails/sprockets-rails/releases)
- [Commits](https://github.com/rails/sprockets-rails/compare/v3.2.2...v3.4.0)

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

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