update finder dependency to 6.1

[kkmuffme]

Could the dependency for symfony/finder be updated from ^5.0 to ^6.0?
There's a bug in v5 finder which will not find certain files (e.g. in WooCommerce), which is why this would be necessary

[szepeviktor]

Hello @kkmuffme !
This is not an active package, just a fork with PR-s.

I do it for you: #17