[Static Analysis] Use Rector 0.9 for 4.1 branch with php version feature 7.3

Author: samsonasik

composer.json

@@ -21,7 +21,7 @@
 		"phpstan/phpstan": "^0.12",
 		"phpunit/phpunit": "^9.1",
 		"predis/predis": "^1.1",
-		"rector/rector": "^0.8",
+		"rector/rector": "^0.9",
 		"squizlabs/php_codesniffer": "^3.3"
 	},
 	"suggest": {

rector.php

@@ -30,7 +30,7 @@
 	// auto import fully qualified class names
 	$parameters->set(Option::AUTO_IMPORT_NAMES, true);
 	$parameters->set(Option::ENABLE_CACHE, true);
-	$parameters->set(Option::PHP_VERSION_FEATURES, '7.2');
+	$parameters->set(Option::PHP_VERSION_FEATURES, '7.3');
 
 	$services = $containerConfigurator->services();
 	$services->set(UnderscoreToCamelCaseVariableNameRector::class);