Update setup.py, exclude 'test'

[onkelbeh]

Otherwise:

* Messages for package dev-python/pyvlx-0.2.21:

 * The following unexpected files/directories were found top-level
 * in the site-packages directory:
 *
 *   /usr/lib/python3.11/site-packages/test
 *
 * This is most likely a bug in the build system.  More information
 * can be found in the Python Guide:
 * https://projects.gentoo.org/python/guide/qawarn.html#stray-top-level-files-in-site-packages
 * ERROR: dev-python/pyvlx-0.2.21::HomeAssistantRepository failed (install phase):
 *   Failing install because of stray top-level files in site-packages

I hope you don't mind I included your component for Home Assistant Gentoo Overlay. I do not use this component myself. But, during compilation test, the installation test script threw an error, because setup.py tries to install a package called tests at top level.

My change only adds a generic exclusion to find_packages().

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (4ae18e3) 80.00% compared to head (3f08bf0) 80.00%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #370 +/- ## ======================================= Coverage 80.00% 80.00% ======================================= Files 77 77 Lines 3560 3560 ======================================= Hits 2848 2848 Misses 712 712 ```

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