Bump sass from 1.77.5 to 1.77.6 in /webapp

Bumps sass from 1.77.5 to 1.77.6.

Changelog

Sourced from sass's changelog.

1.77.6

• Fix a few cases where comments and occasionally even whitespace wasn't allowed between the end of Sass statements and the following semicolon.

Commits

• 7aae1e6 Fix a bug where comments were incorrectly forbidden in some cases (#2264)
• cf6f9d0 Build AOT releases with native arm64 runners (#2262)
• See full diff in compare view

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