Ensure old response content is closed out for hot reload

src/BlazorWebView/src/SharedSource/StaticContentHotReloadManager.cs

@@ -67,6 +67,7 @@ public static bool TryReplaceResponseContent(string contentRootRelativePath, str
 				if (_updatedContent.TryGetValue((assemblyName, relativePath), out var values))
 				{
 					responseStatusCode = 200;
+					responseContent.Close();
 					responseContent = new MemoryStream(values.Content);
 					if (!string.IsNullOrEmpty(values.ContentType))
 					{