build: small adjustments for tox

Author: scanny

pyproject.toml

@@ -30,8 +30,7 @@ dynamic = ["version"]
 keywords = ["docx", "office", "openxml", "word"]
 license = { text = "MIT" }
 readme = "README.md"
-# requires-python = ">=3.9"
-requires-python = ">=3.9,<3.10"
+requires-python = ">=3.9"
 
 [dependency-groups]
 dev = [
@@ -44,6 +43,7 @@ dev = [
     "pyright>=1.1.401",
     "pytest>=8.4.0",
     "ruff>=0.11.13",
+    "tox>=4.26.0",
     "types-lxml-multi-subclass>=2025.3.30",
 ]
 

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py38, py39, py310, py311, py312
+envlist = py39, py310, py311, py312, py313
 
 [testenv]
 deps = -rrequirements-test.txt