Configure py314 tox environment for free-threading build compatibility

Set basepython to 'python' for the py314 environment to use whatever
Python interpreter is available in PATH. This fixes the issue where
tox cannot find the Python 3.14t (free-threading) interpreter, as
GitHub Actions sets up the correct Python in PATH but tox's automatic
interpreter discovery doesn't recognize the free-threading build.

Author: theskumar

tox.ini

@@ -23,6 +23,9 @@ depends =
     py{310,311,312,313,314},pypy3: coverage-clean
     coverage-report: py{310,311,312,313,314},pypy3
 
+[testenv:py314]
+basepython = python
+
 [testenv:lint]
 skip_install = true
 deps =