Use while (true) instead of for (;;)

Co-authored-by: Oliver Klee <github@oliverklee.de>

src/RuleSet/RuleSet.php

@@ -65,7 +65,7 @@ public static function parseRuleSet(ParserState $parserState, RuleSet $ruleSet):
         while ($parserState->comes(';')) {
             $parserState->consume(';');
         }
-        for (;;) {
+        while (true) {
             $commentsBeforeRule = $parserState->consumeWhiteSpace();
             if ($parserState->comes('}')) {
                 break;