re-enable doctests using pytest-cython

Since upstream fixed the issues with pytest-8 in a new release.

tox.ini

@@ -25,15 +25,14 @@ setenv =
 deps =
     {[tox]deps}
     pytest
-    #pytest-cython
+    pytest-cython
 
 [testenv:python]
 description = run tests for default system python
 commands =
     python setup.py build_ext --inplace --develop
-    # run doctests -- disabled until upstream issue with pytest-8 is fixed
-    # see: https://github.com/lgpage/pytest-cython/issues/58
-    #pytest --doctest-cython src/pkgcraft
+    # run doctests
+    pytest --doctest-cython src/pkgcraft
     # run regular tests
     pytest {posargs}
 
@@ -47,9 +46,8 @@ deps =
 commands =
     # build cython extensions with coverage enabled
     python setup.py build_ext --inplace --cython-coverage --develop
-    # run doctests -- disabled until upstream issue with pytest-8 is fixed
-    # see: https://github.com/lgpage/pytest-cython/issues/58
-    #coverage run -m pytest --doctest-cython src/pkgcraft
+    # run doctests
+    coverage run -m pytest --doctest-cython src/pkgcraft
     # run regular tests
     coverage run -m pytest {posargs}
     coverage combine
@@ -63,9 +61,8 @@ description = run tests under valgrind to find memory handling issues
 allowlist_externals = valgrind
 commands =
     python setup.py build_ext --inplace
-    # run doctests -- disabled until upstream issue with pytest-8 is fixed
-    # see: https://github.com/lgpage/pytest-cython/issues/58
-    #valgrind pytest --doctest-cython src/pkgcraft
+    # run doctests
+    valgrind pytest --doctest-cython src/pkgcraft
     # run regular tests, skipping parallelized ones that cause failures
     valgrind pytest -m "not parallel" {posargs}