[TOOLS] Continue raising PHPStan level to 6

components/Language/Entity/Language.php

@@ -134,6 +134,9 @@ class Language extends Entity
         return self::getById($note->getLanguageId());
     }
 
+    /**
+     * @return array<string, string>
+     */
     public static function getLanguageChoices(): array
     {
         $langs = Cache::getHashMap(
@@ -144,6 +147,8 @@ class Language extends Entity
         return array_merge(...F\map(array_values($langs), fn ($l) => $l->toChoiceFormat()));
     }
 
+    /**
+     * @return array<string, string> */
     public function toChoiceFormat(): array
     {
         return [_m($this->getLongDisplay()) => $this->getLocale()];
@@ -152,6 +157,8 @@ class Language extends Entity
     /**
      * Get all the available languages as well as the languages $actor
      * prefers and are appropriate for posting in/to $context_actor
+     *
+     * @return array{array<string, string>, array<string, string>}
      */
     public static function getSortedLanguageChoices(?Actor $actor, ?Actor $context_actor, ?bool $use_short_display): array
     {