[TASK] Release preparations for 9.0.2

Fix many php8 notices

Signed-off-by: Marcus Schwemer <marcus.schwemer@in2code.de>

Author: mschwemer

ext_emconf.php

@@ -9,7 +9,7 @@
         and easy to use mailform extension with a lots of features
         (spam prevention, marketing information, optin, ajax submit, diagram analysis, etc...)',
     'category' => 'plugin',
-    'version' => '9.0.1',
+    'version' => '9.0.2',
     'state' => 'beta',
     'author' => 'Powermail Development Team',
     'author_email' => 'service@in2code.de',