Try working around package installation issues

Author: A5rocks

tox.ini

@@ -97,13 +97,12 @@ base_python = 3.13
 commands =
     pre-commit run pip-compile --all-files
 
-# TODO: allow specifying e.g. typing-3.11 to run with --python[-]version=3.11
 [testenv:typing]
 description = "Run type checks: mypy on all platforms, and pyright on `src/trio[/_core]/_tests/type_tests/`."
 deps =
     -r test-requirements.txt
     exceptiongroup
-base_python = 3.13
+base_python = 3.11
 set_env =
     PYRIGHT_PYTHON_IGNORE_WARNINGS=1
 commands =