PHP 8.1 compatibility

[oranges13]

What version of this package are you using?
0.30.1

What operating system, Node.js, and npm version?
Ubuntu Linux (Xenial) / PHP 8.1

What happened?
Running unit tests with PHPUnit results in deprecation messages:

PHP Deprecated:  Return type of Noodlehaus\AbstractConfig::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice

What did you expect to happen?
Running tests will not display deprecation messages

Are you willing to submit a pull request to fix this bug?
I cannot at this time.

However, the solution should be updating the version of hassankhan/config in use to the version which supports PHP8.1

[mikeerickson]

This issue has been resolved in 0.32.0