Update phpcs minimum dependency from 3.5.7 to 3.13.5

Author: sirbrillig

composer.json

@@ -51,7 +51,7 @@
 	},
 	"require": {
 		"php": ">=5.4.0",
-		"squizlabs/php_codesniffer": "^3.5.7 || ^4.0.0",
+		"squizlabs/php_codesniffer": "^3.13.5 || ^4.0.0",
 		"phpcsstandards/phpcsutils": "^1.0"
 	},
 	"require-dev": {