Update linters

Author: edg2s

composer.json

@@ -6,7 +6,7 @@
 	"require-dev": {
 		"jakub-onderka/php-parallel-lint": "1.0.0",
 		"jakub-onderka/php-console-highlighter": "0.4.0",
-		"mediawiki/mediawiki-codesniffer": "29.0.0"
+		"mediawiki/mediawiki-codesniffer": "31.0.0"
 	},
 	"scripts": {
 		"test": [