Remove abandoned nette/finder dependency

[karelattl]

Closes #142

Problem

nette/finder is marked as abandoned on Packagist (merged into nette/utils). This causes composer audit to fail, breaking CI pipelines.

$ composer audit
Found 1 abandoned package:
+-------------------+------------------------+
| Abandoned Package | Suggested Replacement  |
+-------------------+------------------------+
| nette/finder      | none                   |
+-------------------+------------------------+

Analysis

The codebase already uses Nette\Utils\Finder (not Nette\Finder\Finder), so the explicit dependency on nette/finder in composer.json is no longer needed.

Solution

Remove "nette/finder": "^2.5.2|^3.0.0" from require section in composer.json.

The Finder class is available via nette/utils ^4.0 which is already a dependency.

[aleswita]

tnx