Update `@since` tag on taxonomy hooks to be introduced in 5.1.0.

The hooks were added in [43558] but pulled from the 4.9.x and 5.0.x series.

Fixes #44733.
Built from https://develop.svn.wordpress.org/trunk@44321


git-svn-id: http://core.svn.wordpress.org/trunk@44151 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/taxonomy.php

@@ -626,7 +626,7 @@ function register_taxonomy_for_object_type( $taxonomy, $object_type ) {
 	/**
 	 * Fires after a taxonomy is registered for an object type.
 	 *
-	 * @since 4.9.9
+	 * @since 5.1.0
 	 *
 	 * @param string $taxonomy    Taxonomy name.
 	 * @param string $object_type Name of the object type.
@@ -668,7 +668,7 @@ function unregister_taxonomy_for_object_type( $taxonomy, $object_type ) {
 	/**
 	 * Fires after a taxonomy is unregistered for an object type.
 	 *
-	 * @since 4.9.9
+	 * @since 5.1.0
 	 *
 	 * @param string $taxonomy    Taxonomy name.
 	 * @param string $object_type Name of the object type.

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44320';
+$wp_version = '5.1-alpha-44321';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.