chore: remove non-existant conversations resource

Author: tharropoulos

src/Conversations.php

@@ -37,15 +37,6 @@ public function __construct(ApiCall $apiCall)
         $this->typesenseModels = new ConversationModels($this->apiCall);
     }
 
-    /**
-     * @return array
-     * @throws TypesenseClientError|HttpClientException
-     */
-    public function retrieve(): array
-    {
-        return $this->apiCall->get(static::RESOURCE_PATH, []);
-    }
-
     /**
      * @return Models
      */