build: update package file versions to 3.15.0

Author: GitHub Action

api-event-manager.php

@@ -4,7 +4,7 @@
  * Plugin Name:       Event Manager
  * Plugin URI:        https://github.com/helsingborg-stad/api-event-manager
  * Description:       Creates a api that may be used to manage events
- * Version: 3.14.1
+ * Version: 3.15.0
  * Author:            Thor Brink, Sebastian Thulin @ Helsingborg Stad
  * Author URI:        https://github.com/helsingborg-stad
  * License:           MIT

composer.json

@@ -73,5 +73,5 @@
             "johnpbloch/wordpress-core-installer": true
         }
     },
-    "version": "3.14.1"
+    "version": "3.15.0"
 }