Twenty Twenty-One: Use `esc_url()` for the WordPress.org link in `footer.php`.

Props mukesh27, poena.
Fixes #51954.
Built from https://develop.svn.wordpress.org/trunk@49762


git-svn-id: http://core.svn.wordpress.org/trunk@49485 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentytwentyone/footer.php

@@ -58,7 +58,7 @@
 				printf(
 					/* translators: %s: WordPress. */
 					esc_html__( 'Proudly powered by %s.', 'twentytwentyone' ),
-					'<a href="' . esc_attr__( 'https://wordpress.org/', 'twentytwentyone' ) . '">WordPress</a>'
+					'<a href="' . esc_url( __( 'https://wordpress.org/', 'twentytwentyone' ) ) . '">WordPress</a>'
 				);
 				?>
 			</div><!-- .powered-by -->

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.7-alpha-49761';
+$wp_version = '5.7-alpha-49762';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.