Convert RootTypeCache namespace to file-scoped format

Co-authored-by: javiercn <[email protected]>

Author: Copilot

src/Components/Shared/src/RootTypeCache.cs

@@ -5,8 +5,7 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
 
-namespace Microsoft.AspNetCore.Components
-{
+namespace Microsoft.AspNetCore.Components;
 
 // A cache for root component types
 internal sealed class RootTypeCache
@@ -90,4 +89,3 @@ public bool Equals(Key other) => string.Equals(Assembly, other.Assembly, StringC
         public override int GetHashCode() => HashCode.Combine(Assembly, Type);
     }
 }
-}