Support the latest DartDoc (#2472)

The bug we were working around has been fixed in dart-lang/dartdoc#3951.

Author: nex3

pkg/sass_api/pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
   sass: 1.83.0
 
 dev_dependencies:
-  dartdoc: ">=8.0.14 <8.3.1" # dart-lang/dartdoc#3947
+  dartdoc: ^8.0.14
 
 dependency_overrides:
   sass: { path: ../.. }

pubspec.yaml

@@ -42,7 +42,7 @@ dev_dependencies:
   archive: ^3.1.2
   crypto: ^3.0.0
   dart_style: ^3.0.0
-  dartdoc: ">=8.0.14 <8.3.1" # dart-lang/dartdoc#3947
+  dartdoc: ^8.0.14
   grinder: ^0.9.0
   node_preamble: ^2.0.2
   lints: ">=4.0.0 <6.0.0"