[TASK] Prepare bugfix release

Resolves: #646

Author: extcode

Documentation/guides.xml

@@ -11,7 +11,7 @@
                interlink-shortcode="extcode/cart"
     />
     <project title="Cart"
-             release="11.3.0"
+             release="11.3.1"
              version="11.3"
              copyright="2018 - 2025"
     />

ext_emconf.php

@@ -4,7 +4,7 @@
     'title' => 'Cart',
     'description' => 'Shopping Cart(s) for TYPO3',
     'category' => 'plugin',
-    'version' => '11.3.0',
+    'version' => '11.3.1',
     'state' => 'stable',
     'author' => 'Daniel Gohlke',
     'author_email' => 'ext@extco.de',