Merge branch '266-can-t-upload-a-new-extension-after-creating-a-new-extension-key' into 'develop'

Removes version return type

Closes #266 and #265

See merge request t3o/ter!249

html/typo3conf/ext/ter_fe2/Classes/Domain/Model/Extension.php

@@ -373,7 +373,7 @@ class Extension extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      *
      * @return \T3o\TerFe2\Domain\Model\Version lastVersion
      */
-    public function getLastVersion(): Version
+    public function getLastVersion()
     {
         return $this->lastVersion;
     }