tox: Fix tests on 3.12

Requires tox to upgrade pip

Author: Techcable

tox.ini

@@ -4,14 +4,19 @@ requires =
 
 # Keep in sync with 'requires_python' in pyproject.toml
 # HACK: Does not test 3.12, because removal of pkgutil.ImpImporter breaks things
-envlist = py{39,310,311,313}
+envlist = py{39,310,311,312,313}
 isolated_build = true
 
 [testenv]
 description = run unit tests
 labels = test
 deps =
     pytest
+    pytest-asyncio
     pytest-sugar
+    pydantic
 commands =
-    pytest {posargs:tests}
+    pytest {posargs:tests}
+# need to upgrade pip or else 3.12 breaks
+download = true
+