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This is not a Gradle issue.  There is a compilation error with your code that needs to be addressed.

const Scrollbar({
  super.key,
  required this.child,
  this.controller,
  this.thumbVisibility,
  this.trackVisibility,
  this.thickness,
  this.radius,
  this.notificationPredicate,
  this.interactive,
  this.scrollbarOrientation,
  @Deprecated(
    'Use ScrollbarThemeData.trackVisibility to resolve based on the current state instead. '
    'This feature was deprecated after v3.4.0-19.0.pre.',
  )
  this.showTrackOnHover,
}); this is the code, what am I missing?

No idea.  This is a _Gradle_ support forum - please enquire in a coding-language-specifc support venue.