Symfony version(s) affected: 5.2.8

Description
The gitignore pattern parsing no longer handles patterns like **/vendor/**, which are respected by .gitignore and have also been working perfectly fine with the symfony/finder component up until now.

Possible Solution
Revert and rethink the "fix" that rewrote the gitignore parsing in symfony/finder (this commit).

Additional context
We're using this component via PHP CS Fixer.