feat!: Add compatibility with Timber 2.x #125

Job	Run time
PHP 7.4 \| WP 5.5 \| prefer-stable	3m 57s
PHP 7.4 \| WP 5.5 (MS) \| prefer-stable	3m 54s
PHP 7.4 \| WP latest \| prefer-stable	3m 49s
PHP 7.4 \| WP latest (MS) \| prefer-stable	3m 54s
PHP 7.4 \| WP trunk \| prefer-stable	3m 53s
PHP 8.1 \| WP trunk \| prefer-stable	4m 12s
PHP 8.0 \| WP latest \| prefer-stable	4m 10s
PHP 8.1 \| WP latest \| prefer-stable	3m 39s
PHP 7.4 (Imagick) \| WP latest \| prefer-stable	3m 52s
PHP 7.4 (with coverage) \| WP latest \| prefer-stable	3m 52s
	39m 12s

Provide feedback