Bump premailer-rails from 1.11.1 to 1.12.0

[dependabot[bot]]

Bumps premailer-rails from 1.11.1 to 1.12.0.

Changelog

Sourced from premailer-rails's changelog.

v1.12.0

• Lazily load actionmailer (@​c960657, #260)
• HTTP request for CSS files now have an Accept: text/css header (@​ElMassimo, #261)
• Added support for Propshaft (@​Intrepidd, #277)

Commits

• 33287e8 Bump version to 1.12.0
• 7897bb7 Merge pull request #277 from fphilipe/support-propshaft
• e0d5465 Add support for Propshaft
• f8c7019 Improve env vars in action
• 70b9fd9 Set env vars in GitHub Actions
• 9259af4 Add note about supported Rails versions
• eb80c8c Fix specs
• d221928 Merge pull request #261 from ElMassimo/mime
• 3137b11 Fix sprockets version
• 1c98754 Remove Sprockets specific file
• Additional commits viewable in compare view

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This pull request has merge conflicts that must be resolved before it can be merged.