build: Remove Python 3.8 from tox configuration.

Author: seifertm

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.14.0
-envlist = py38, py39, py310, py311, py312, py13, pytest-min, docs
+envlist = py39, py310, py311, py312, py13, pytest-min, docs
 isolated_build = true
 passenv =
     CI
@@ -71,7 +71,6 @@ skip_install = false
 
 [gh-actions]
 python =
-    3.8: py38
     3.9: py39, pytest-min
     3.10: py310
     3.11: py311