[CLEANUP] Reorder uses in DeclarationBlockTest (#1344)

Order alphabetically.

Author: JakeQZ

tests/Unit/RuleSet/DeclarationBlockTest.php

@@ -7,8 +7,8 @@
 use PHPUnit\Framework\TestCase;
 use Sabberworm\CSS\CSSElement;
 use Sabberworm\CSS\CSSList\CSSListItem;
-use Sabberworm\CSS\Position\Positionable;
 use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Position\Positionable;
 use Sabberworm\CSS\Property\Selector;
 use Sabberworm\CSS\RuleSet\DeclarationBlock;
 use Sabberworm\CSS\Settings;