Change woocommerce loop product title heading

if ( ! function_exists( 'woocommerce_template_loop_product_title' ) ) {
    /**
     * Show the product title in the product loop. By default this is an H3.
     */
    function woocommerce_template_loop_product_title() {
        $tag = apply_filters( 'woocommerce_template_loop_product_title_tag', 'h4' );
        echo '<' . tag_escape( $tag ) . ' class="woocommerce-loop-product__title">' . get_the_title() . '</' . tag_escape( $tag ) . '>';
    }
}