Multiple deprecations in php 8.1

[beeyev]

Hello, first of all, thanks for the great tool, I have been using it for quite a long time.
But it seems that the library needs to be updated in order to work with PHP 8.1 I get these errors:

Deprecated: Return type of HumbugBox391\KevinGH\RequirementChecker\RequirementCollection::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in phar:///usr/local/bin/fink/.box/src/RequirementCollection.php on line 15

Deprecated: Return type of HumbugBox391\KevinGH\RequirementChecker\RequirementCollection::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in phar:///usr/local/bin/fink/.box/src/RequirementCollection.php on line 19

Deprecated: Return type of Symfony\Component\Console\Helper\HelperSet::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in phar:///usr/local/bin/fink/vendor/symfony/console/Helper/HelperSet.php on line 94

Could you please fix that?

[dantleech]

Hi, there do not look like deprecations with Fink code itself, but possibly the dependencies need to be widened to allow more recent versions, feel free to make a PR :)