Do not pollute component directory.

--- elementpath-5.1.2/tox.ini.orig
+++ elementpath-5.1.2/tox.ini
@@ -10,7 +10,6 @@
     docs, mypy-py{310,311,312,313,314,315}, pytest, coverage,
     xmlschema{401,410}, w3c-xsdtests, w3c-qt3tests
 skip_missing_interpreters = true
-work_dir = {tox_root}/../.tox/elementpath
 
 [testenv]
 deps =