chore: use file-scoped namespace

src/Shared/HandyControl_Shared/Interactivity/TriggerAction`1.cs

@@ -1,19 +1,18 @@
 using System;
 using System.Windows;
 
-namespace HandyControl.Interactivity
+namespace HandyControl.Interactivity;
+
+public abstract class TriggerAction<T> : TriggerAction where T : DependencyObject
 {
-    public abstract class TriggerAction<T> : TriggerAction where T : DependencyObject
+    protected TriggerAction() : base(typeof(T))
     {
-        protected TriggerAction() : base(typeof(T))
-        {
-        }
+    }
 
 #pragma warning disable 108,114
-        protected T AssociatedObject => (T) base.AssociatedObject;
+    protected T AssociatedObject => (T) base.AssociatedObject;
 #pragma warning restore 108,114
 
-        protected sealed override Type AssociatedObjectTypeConstraint =>
-            base.AssociatedObjectTypeConstraint;
-    }
-}
+    protected sealed override Type AssociatedObjectTypeConstraint =>
+        base.AssociatedObjectTypeConstraint;
+}