Update composer autoload

[kuuak]

Update of the composer autoload to load CoreImageBlockToMediaItemConnection class after v0.3.12 update.

PHP error

PHP Fatal error:  Uncaught Error: Class "WPGraphQLGutenberg\\Schema\\Types\\Connection\\Blocks\\CoreImageBlockToMediaItemConnection" not found in /var/www/html/wp-content/plugins/wp-graphql-gutenberg/src/Schema/Schema.php:12
Stack trace:
#0 /var/www/html/wp-content/plugins/wp-graphql-gutenberg/plugin.php(95): WPGraphQLGutenberg\\Schema\\Schema->__construct()
#1 /var/www/html/wp-includes/class-wp-hook.php(307): WPGraphQLGutenberg\\WPGraphQLGutenberg->WPGraphQLGutenberg\\{closure}('')
#2 /var/www/html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array)
#3 /var/www/html/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#4 /var/www/html/wp-content/plugins/wp-graphql/src/Request.php(139): do_action('init_graphql_re...')
#5 /var/www/html/wp-content/plugins/wp-graphql/src/Router.php(459): WPGraphQL\\Request->__construct()
#6 /var/www/html/wp-content/plugins/wp-graphql/src/Router.php(265): WPGraphQL\\Router::process_http_request()
#7 /var/www/html/wp-includes/class-wp-hook.php(307): WPGraphQL\\Router::resolve_http_request(Object(WP))
#8 /var/www/html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#9 /var/www/html/wp-includes/plugin.php(522): WP_Hook->do_action(Array)
#10 /var/www/html/wp-includes/class-wp.php(396): do_action_ref_array('parse_request', Array)
#11 /var/www/html/wp-includes/class-wp.php(758): WP->parse_request('')
#12 /var/www/html/wp-includes/functions.php(1310): WP->main('')
#13 /var/www/html/wp-blog-header.php(16): wp()
#14 /var/www/html/index.php(17): require('/var/www/html/w...')
#15 {main}
  thrown in /var/www/html/wp-content/plugins/wp-graphql-gutenberg/src/Schema/Schema.php on line 12, referer: http://localhost/wp-admin/admin.php?page=graphiql-ide