This PR was merged into the 1.2-dev branch.

Discussion
----------

Add support for composer-plugin-api v2

Composer version 2 has `composer-plugin-api` version 2, and this plugin attemts to support both API versions.

See [What's new in Composer 2](https://php.watch/articles/composer-2) and [UPGRADE-2.0](https://github.com/composer/composer/blob/master/UPGRADE-2.0.md#for-integrators-and-plugin-authors) for more changes in API.

 - Empty methods `\Symfony\Thanks\Thanks::deactivate()` and `\Symfony\Thanks\Thanks::uninstall()` are added to make it compatible both versions.
 - On Composer v2, `\Hirak\Prestissimo\CurlRemoteFilesystem` is not used in favor of Composer's native `\Composer\Util\HttpDownloader` which make multiple Curl connections.

Related: #84 and composer/composer#8726.

`thanks` 🙏

Commits
-------

7502bef Add support for composer-plugin-api v2