Replace deprecated dart-sass with sass

[Copilot]

The dart-sass package was deprecated and renamed to sass. Updated webpack configuration and dependencies to use the replacement package.

Changes

• modules/gob-web/package.json: Updated dependency from dart-sass@1.25.0 to sass@1.94.0
• modules/gob-web/webpack.config.js: Changed require("dart-sass") to require("sass") in sass-loader configuration
• flow-typed/npm/: Renamed Flow type definition from dart-sass_vx.x.x.js to sass_vx.x.x.js

The API is identical between packages; only the package name changed.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Replace deprecated dependency "dart-sass"</issue_title>
<issue_description>TODO: what is the recommended replacement? Research and find out. Look at the deprecation warning; it may recommend an upgrade path.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Replace deprecated dependency "dart-sass" #3064

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