chore(release): 2.16.0-alpha.1 [skip ci]

# [2.16.0-alpha.1](v2.15.0...v2.16.0-alpha.1) (2024-06-25)

### Features

* ensure regenerator-runtime is available (for WP 6.6) ([#459](#459)) ([58666bb](58666bb))

newspack-listings.php

@@ -7,7 +7,7 @@
  * Author URI:      https://newspack.com
  * Text Domain:     newspack-listings
  * Domain Path:     /languages
- * Version:         2.15.0
+ * Version:         2.16.0-alpha.1
  *
  * @package         Newspack_Listings
  */
@@ -19,7 +19,7 @@
 	define( 'NEWSPACK_LISTINGS_FILE', __FILE__ );
 	define( 'NEWSPACK_LISTINGS_PLUGIN_FILE', plugin_dir_path( NEWSPACK_LISTINGS_FILE ) );
 	define( 'NEWSPACK_LISTINGS_URL', plugin_dir_url( NEWSPACK_LISTINGS_FILE ) );
-	define( 'NEWSPACK_LISTINGS_VERSION', '2.15.0' );
+	define( 'NEWSPACK_LISTINGS_VERSION', '2.16.0-alpha.1' );
 }
 
 // Include plugin resources.