Fixes Fatal Error: Declaration of Symfony\Flex\ParallelDownloader #876
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Fatal Error: Declaration of Symfony\Flex\ParallelDownloader::copy must be compatible with Composer\Util\RemoteFilesystem::copy
Add return types to be compatible with composer changes
Newest version of composer added return types to these functions (@see composer/composer@a16ed3d). Now you get Fatal Errors when using new composer:
Declaration of Symfony\Flex\ParallelDownloader::copy($originUrl, $fileUrl, $fileName, $progress = true, $options = Array) must be compatible with Composer\Util\RemoteFilesystem::copy($originUrl, $fileUrl, $fileName, $progress = true, $options = Array): bool