Configure tox to use system Python

WhyNotHugo · WhyNotHugo · commit 389dc5fac558 · 2024-09-20T11:02:00.000+02:00
This makes it usable by contributors by default. CI pipelines explicitly
override the version of Python used.
diff --git a/tox.ini b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = {py38,py39,py310,py311}{,-images}
+envlist = py,py-images
 skip_missing_interpreters = True
 
 [testenv]
