build: Upgrade mediawiki/mediawiki-codesniffer to v43.0.0

Change-Id: I0d24bbd4fec38b24f49269c2f2997ad21e2602fc

.phpcs.xml

@@ -2,4 +2,6 @@
 <ruleset>
 	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki" />
 	<file>.</file>
+	<arg name="extensions" value="php" />
+	<arg name="encoding" value="UTF-8" />
 </ruleset>

composer.json

@@ -1,6 +1,6 @@
 {
 	"require-dev": {
-		"mediawiki/mediawiki-codesniffer": "41.0.0",
+		"mediawiki/mediawiki-codesniffer": "43.0.0",
 		"mediawiki/mediawiki-phan-config": "0.14.0",
 		"mediawiki/minus-x": "1.1.1",
 		"php-parallel-lint/php-console-highlighter": "1.0.0",
@@ -18,5 +18,10 @@
 		],
 		"phan": "phan -d . --long-progress-bar",
 		"phpcs": "phpcs -sp --cache"
+	},
+	"config": {
+		"allow-plugins": {
+			"dealerdirect/phpcodesniffer-composer-installer": true
+		}
 	}
 }