0.4.0: new version ready, `uv_queue_work` works on PHP 8+

- Linux tests pass as is, Windows after callback not executed and segfaults still.

In reference to issues: https://github.com/amphp/ext-uv/issues/83, https://github.com/amphp/ext-uv/issues/93, https://github.com/amphp/ext-uv/issues/64