Fix: Case

[localheinz]

This pull request

• [x] fixes the case of referenced classes

💁‍♂️ For reference, see https://github.com/phar-io/phive/pull/404/checks#step:8:22.

[theseer]

Actually, even though it sounded correct, I'm no longer convinced:

• https://github.com/phar-io/phive/actions/runs/8535868585/job/23383178536
• The PharIo\Phive\GnuPG creates a class alias to mimic the pecl gnupg extension. I'm more and more convinced that was a bad idea but that's how it currently is ;)

What do we do here? :)