Fix typ error

Author: LKaemmerling

src/Models/Servers/Servers.php

@@ -71,7 +71,7 @@ public function get(int $serverId): Server
      * @return \LKDev\HetznerCloud\Models\Servers\Server|null
      * @throws \LKDev\HetznerCloud\APIException
      */
-    public function getByName(string $serverName): Server
+    public function getByName(string $serverName)
     {
         $servers = $this->all(new ServerRequestOpts($serverName));
 

src/Models/Volumes/Volumes.php

@@ -55,7 +55,7 @@ public function all(RequestOpts $requestOpts = null): array
      * @return \LKDev\HetznerCloud\Models\Volumes\Volume|null
      * @throws \LKDev\HetznerCloud\APIException
      */
-    public function getByName(string $volumeName): Server
+    public function getByName(string $volumeName)
     {
         $volumes = $this->all(new VolumeRequestOpts($volumeName));