Fix tox configuration for Python 3.14 free-threading support

Add explicit basepython configuration for py314 environment to ensure
tox can find the Python 3.14 interpreter, including the free-threading
build (3.14t).

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 = python3.14
+
 [testenv:lint]
 skip_install = true
 deps =