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function dvk_dequeue_scripts() {
    
    $load_scripts = false;

    if( is_singular() ) {
    	$post = get_post();

    	if( has_shortcode($post->post_content, 'contact-form-7') ) {
        	$load_scripts = true;
    	}

    }

    if( ! $load_scripts ) {
        wp_dequeue_script( 'contact-form-7' );
        wp_dequeue_style( 'contact-form-7' );
    }

}

add_action( 'wp_enqueue_scripts', 'dvk_dequeue_scripts', 99 );