Apply fixes from StyleCI

Author: StyleCIBot

src/Renderer/HtmlRenderer.php

@@ -12,7 +12,6 @@
 use Yiisoft\ErrorHandler\CompositeException;
 use Yiisoft\ErrorHandler\ErrorData;
 use Yiisoft\ErrorHandler\Exception\ErrorException;
-use Yiisoft\ErrorHandler\Solution\SolutionProviderInterface;
 use Yiisoft\ErrorHandler\ThrowableRendererInterface;
 use Yiisoft\FriendlyException\FriendlyExceptionInterface;
 use Yiisoft\Http\Header;