dart-sdk: support two level namespace for macOS, dart-sass 1.99.0 (new formula)

[daeho-ro]

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Revisit

• dart-sass 1.97.3 (new formula) #267762

[daeho-ro]

I have reverted the latest changes, it doesn't work as expected.

[daeho-ro]

I have tried to build with aot-snapshot for macos, but audit failes,

dart-sass
  * Libraries were compiled with a flat namespace.
    This can cause linker errors due to name collisions and
    is often due to a bug in detecting the macOS version.
      /opt/homebrew/Cellar/dart-sass/1.98.0/libexec/sass.aot

and it doesn't respect MACOSX_DEPLOYMENT_TARGET. Not sure how to push target version.

btw, 1.99.0 is out, should update.

[github-actions]

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