sass
Delete unreachable `default` clause.
The Dart analyzer will soon be changed so that if the default clause of a switch statement is determined to be unreachable by the exhaustiveness checker, a new warning of type
unreachable_switch_default will be issued. This parallels the behavior of the existing unreachable_switch_case warning, which is issued whenever a case clause of a switch statement is determined to be unreachable. For details see
https://github.com/dart-lang/sdk/issues/54575.
This PR deletes an unreachable default clause from dart-sass now, to avoid a spurious warning when the analyzer change lands.
@nex3 Sorry for not bundling this with the very similar https://github.com/sass/dart-sass/pull/2318. I'm working my way through a google3 LSC, and I failed to notice that these two changes both affected the same open source repo.