chore: make Release type equatable (#3117)

packages/shorebird_code_push_client/test/src/code_push_client_test.dart

@@ -1163,7 +1163,7 @@ void main() {
                       flutterRevision: flutterRevision,
                       flutterVersion: flutterVersion,
                       displayName: displayName,
-                      platformStatuses: {},
+                      platformStatuses: const {},
                       createdAt: DateTime(2023),
                       updatedAt: DateTime(2023),
                     ),
@@ -1683,7 +1683,9 @@ void main() {
             flutterRevision: flutterRevision,
             flutterVersion: flutterVersion,
             displayName: 'v1.0.0',
-            platformStatuses: {ReleasePlatform.android: ReleaseStatus.draft},
+            platformStatuses: const {
+              ReleasePlatform.android: ReleaseStatus.draft,
+            },
             createdAt: DateTime(2022),
             updatedAt: DateTime(2023),
           ),
@@ -1694,7 +1696,7 @@ void main() {
             flutterRevision: flutterRevision,
             flutterVersion: flutterVersion,
             displayName: 'v1.0.1',
-            platformStatuses: {},
+            platformStatuses: const {},
             createdAt: DateTime(2022),
             updatedAt: DateTime(2023),
           ),