update dependency, bug fix

• merged bug fix issue #1
• fix/cleanup uv_spawn() internal handling

Note: The uv_queue_work() feature currently not possible without PHP C source code changes. Use updated symplely/ext-uv release version has that threading feature working on all PHP versions, no PECL needed, pre-built binaries most platforms available at https://github.com/symplely/ext-uv/releases

update dependency, and bug fixes from it, if running under ZTS

0.3.1

Merge branch 'main' into 0.3x

initial release of basic functionality without `uv_queue_work`

amphp/ext-uv#64