chore: downgrade collection version and apply dart format

Author: suojae

dio/pubspec.yaml

@@ -26,7 +26,7 @@ dependencies:
   path: ^1.8.0
 
   dio_web_adapter: '>=1.0.0 <3.0.0'
-  collection: ^1.19.1
+  collection: ">=1.16.0 <2.0.0"
 
 dev_dependencies:
   lints: any

dio/test/parameter_test.dart

@@ -8,6 +8,10 @@ void main() {
 
     final cache = {param1: 'Cached Response'};
 
-    expect(cache.containsKey(param2), true, reason: 'param1 and param2 should be considered equal');
+    expect(
+      cache.containsKey(param2),
+      true,
+      reason: 'param1 and param2 should be considered equal',
+    );
   });
 }