docs: actualize python support version (#3220)

Hello
In PR actualize max support pythonVersion 3.14 -> 3.15 (like
https://github.com/pypa/virtualenv/blob/main/pyproject.toml#L37)

Co-authored-by: vyuroshchin <>

Author: even-even

docs/reference/compatibility.rst

@@ -14,7 +14,7 @@ version is fully supported; previous patch versions work on a best effort basis.
 CPython
 =======
 
-``3.14 >= python_version >= 3.9``
+``3.15 >= python_version >= 3.9``
 
 PyPy
 ====