chore: Update plugin version to 1.2.3 and add master branch to release workflow

.github/workflows/release.yml

@@ -9,6 +9,7 @@ on:
   push:
     branches:
       - main
+      - master
     paths:
       - 'siti-stock-plugin.php'
       - 'includes/**'

siti-stock-plugin.php

@@ -3,7 +3,7 @@
  * Plugin Name:       Siti Stock Plugin
  * Plugin URI:        https://github.com/SitiWeb/siti-stock-plugin
  * Description:       Synchroniseert WooCommerce voorraad met het externe Siti voorraadplatform.
- * Version:           1.2.2
+ * Version:           1.2.3
  * Author:            Siti Web
  * Author URI:        https://www.siti.nl
  * Requires PHP:      8.1
@@ -16,7 +16,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
 
-define( 'SITI_STOCK_PLUGIN_VERSION', '1.2.2' );
+define( 'SITI_STOCK_PLUGIN_VERSION', '1.2.3' );
 define( 'SITI_STOCK_PLUGIN_FILE', __FILE__ );
 define( 'SITI_STOCK_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );