tox: remove dataclasses dependency from regen

bluetech · bluetech · commit 2d2dc4a2a8eb · 2023-04-09T00:18:07.000+03:00
This dep is not needed on newer Pythons.
diff --git a/tox.ini b/tox.ini
@@ -100,7 +100,6 @@ basepython = python3
 passenv =
     SETUPTOOLS_SCM_PRETEND_VERSION_FOR_PYTEST
 deps =
-    dataclasses
     PyYAML
     regendoc>=0.8.1
     sphinx
