Update PHP development dependencies (#139)

composer.json

@@ -34,8 +34,8 @@
 		"mustangostang/spyc": "0.6.3"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "8.*",
-		"mediawiki/mediawiki-codesniffer": "31.0.0"
+		"phpunit/phpunit": "^9",
+		"mediawiki/mediawiki-codesniffer": "34.0.0"
 	},
 	"support": {
 		"issues": "https://github.com/wikimedia/language-data/issues",

src/LanguageUtil.php

@@ -82,7 +82,7 @@ class LanguageUtil {
 	 * Get all the languages. The properties in the returned object are ISO 639 language codes
 	 * The value of each property is an array that has,
 	 * [writing system code, [regions list], autonym]
-	 * @return object
+	 * @return stdClass
 	 */
 	public function getLanguages() {
 		return $this->data->languages;