Use double quoted ruby imports

[fortmarek]

Short description 📝

It seems like main is failing because rubocop is warning about single-quoted strings for eg. require instead of double-quoted: https://github.com/tuist/tuist/runs/2063816194

Checklist ✅

• The code architecture and patterns are consistent with the rest of the codebase.
• The changes have been tested following the documented guidelines.
• The CHANGELOG.md has been updated to reflect the changes. In case of a breaking change, it's been flagged as such.
• In case the PR introduces changes that affect users, the documentation has been updated.

[laxmorek]

👍