[Debarghya-Banerjee]

Trac Ticket: Core-63013

Summary

This PR replaces node-sass with sass in the twentynineteen theme. node-sass is deprecated and no longer maintained, while sass is the official, actively supported implementation of Sass.

[github-actions]

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Props debarghyabanerjee.

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[github-actions]

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The changes in this pull request can previewed and tested using a WordPress Playground instance.

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For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation.

Test this pull request with WordPress Playground.

[t-hamano]

Closing in favor of #12510. Thank you for your work on this!