Add python3.14 to tox environments

Author: mgorny

tox.ini

@@ -14,7 +14,7 @@ envlist =
     clean,
     check,
     docs,
-    {py39,py310,py311,py312,py313,py313-ft,pypy39,pypy310}-{cover,nocov},
+    {py39,py310,py311,py312,py313,py313-ft,py314,py314-ft,pypy39,pypy310}-{cover,nocov},
     report
 ignore_basepython_conflict = true
 
@@ -28,6 +28,8 @@ basepython =
     py312: {env:TOXPYTHON:python3.12}
     py313: {env:TOXPYTHON:python3.13}
     py313ft: {env:TOXPYTHON:python3.13t}
+    py314: {env:TOXPYTHON:python3.14}
+    py314ft: {env:TOXPYTHON:python3.14t}
     {bootstrap,clean,check,report,docs,codecov,coveralls,extension-coveralls}: {env:TOXPYTHON:python3}
 setenv =
     PYTHONPATH={toxinidir}/tests