ci: build docs with default Python, too (#1609)

Author: hynek

.readthedocs.yaml

@@ -18,5 +18,5 @@ build:
 
     build:
       html:
-        - uvx --with tox-uv tox run -e docs-sponsors
-        - uvx --with tox-uv tox run -e docs-build -- $READTHEDOCS_OUTPUT
+        - uv run --only-group tox tox run -e docs-sponsors
+        - uv run --only-group tox tox run -e docs-build -- $READTHEDOCS_OUTPUT

tox.ini

@@ -76,8 +76,7 @@ commands = pytest --codspeed -n auto bench/test_benchmarks.py
 
 
 [testenv:docs-{build,doctests,linkcheck}]
-# Canonical version for everything documentation-related.
-base_python = 3.14
+base_python_file = .python-version-default
 dependency_groups = docs
 commands =
     build: sphinx-build -n -T -W -b html -d {envtmpdir}/doctrees docs {posargs:docs/_build/}html