[TASK] Set version to 4.0.0

Support TYPO3 Version 9 LTS

ext_emconf.php

@@ -25,5 +25,5 @@ $EM_CONF[$_EXTKEY] = [
     'clearCacheOnLoad' => 1,
     'author' => 't3o team',
     'author_email' => 't3o@typo3.org',
-    'version' => '3.7.0',
+    'version' => '4.0.0',
 ];