Remove unused variable

Author: isoos

pkg/pub_worker/lib/src/bin/pana_wrapper.dart

@@ -17,7 +17,6 @@ import 'package:pub_semver/pub_semver.dart';
 import 'package:pub_worker/src/bin/dartdoc_wrapper.dart';
 import 'package:pub_worker/src/sdks.dart';
 import 'package:pub_worker/src/utils.dart';
-import 'package:pubspec_parse/pubspec_parse.dart' as pubspek;
 import 'package:retry/retry.dart';
 
 final _log = Logger('pana');
@@ -219,8 +218,6 @@ Future<({String configKind, String? dartSdkPath, String? flutterSdkPath})>
       flutterSdks.firstWhereOrNull((sdk) => !sdk.version.isPreRelease) ??
           flutterSdks.firstOrNull;
 
-  final minMacrosVersion = pubspec.getDependencyContraintRangeMin('macros');
-
   bool matchesSdks({
     required Version? dart,
     required Version? flutter,
@@ -418,17 +415,3 @@ Future<List<_SdkBundle>> _detectSdkBundles() async {
     ),
   ];
 }
-
-extension on Pubspec {
-  Version? getDependencyContraintRangeMin(String package) {
-    final dep = dependencies[package] ?? devDependencies[package];
-    if (dep is! pubspek.HostedDependency) {
-      return null;
-    }
-    final vc = dep.version;
-    if (vc is! VersionRange) {
-      return null;
-    }
-    return vc.min;
-  }
-}