Fix analysis errors (#2317)

Author: mosuem

pkgs/pubspec_parse/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - Added `toJson` method to `Pubspec` to serialize the object back to a `Map`.
 - Require Dart 3.8
+- Fix analysis issues caused by new lints.
 
 ## 1.5.0
 

pkgs/pubspec_parse/lib/src/pubspec.dart

@@ -186,7 +186,7 @@ class Pubspec {
       );
 
   static List<String> _normalizeAuthors(String? author, List<String>? authors) {
-    final value = <String>{if (author != null) author, ...?authors};
+    final value = <String>{?author, ...?authors};
     return value.toList();
   }
 }