correctly check NoneType, test python 3.11 and 3.12

Author: jdidion

.github/workflows/pythonpackage.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        PYTHON_VERSION: ["3.7", "3.8", "3.9", "3.10"]
+        PYTHON_VERSION: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
     steps:
     - uses: actions/checkout@v2
 

fgpyo/util/inspect.py

@@ -240,7 +240,7 @@ def dict_parse(dict_string: str) -> Dict[Any, Any]:
                 return types.make_enum_parser(type_)
             elif types.is_constructible_from_str(type_):
                 return functools.partial(type_)
-            elif isinstance(type_, type(None)):
+            elif type_ is type(None):
                 return functools.partial(types.none_parser)
             elif types.get_origin_type(type_) is Union:
                 return types.make_union_parser(