Revert "Revert "Audit hashCode overrides outside of packages/flutter (#85370)" (#85451)" (#85567)

This reverts commit 2be0d57fa25423ffcba5a07d22ef9386a89dcf4c.

packages/flutter_tools/lib/src/ios/xcodeproj.dart

diff --git a/packages/flutter_tools/lib/src/ios/xcodeproj.dart b/packages/flutter_tools/lib/src/ios/xcodeproj.dart
index 78b2cc0..5e48bf9 100644
--- a/packages/flutter_tools/lib/src/ios/xcodeproj.dart
+++ b/packages/flutter_tools/lib/src/ios/xcodeproj.dart
@@ -302,7 +302,7 @@
   final EnvironmentType environmentType;
 
   @override
-  int get hashCode => scheme.hashCode ^ configuration.hashCode ^ environmentType.hashCode;
+  int get hashCode => Object.hash(scheme, configuration, environmentType);
 
   @override
   bool operator ==(Object other) {