Fix.

src/_pytask/_hashlib.py

@@ -219,7 +219,13 @@ def hash_value(value: Any) -> int | str:
     Compute the hash of paths, strings, and bytes with a hash function or otherwise the
     hashes are salted.
 
+    The hash of None constant https://github.com/python/cpython/pull/99541 starting with
+    Python 3.12.
+
     """
+    #
+    if value is None:
+        return 4238894112
     if isinstance(value, Path):
         value = str(value)
     if isinstance(value, str):

tests/test_nodes.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import pickle
-import sys
 from pathlib import Path
 
 import pytest
@@ -40,11 +39,7 @@ def test_hash_of_python_node(value, hash_, expected):
         ),
         (
             PythonNode(name="name", value=None),
-            # The hash of None constant https://github.com/python/cpython/pull/99541
-            # starting 3.12.
-            "a1f217807169de3253d1176ea5c45be20f3db2e2e81ea26c918f6008d2eb715b"
-            if sys.version_info >= (3, 12)
-            else "2af47fd015a32bd1b8d7f207930ca0a370f3a866c042d517350b59187a8f4987",
+            "a1f217807169de3253d1176ea5c45be20f3db2e2e81ea26c918f6008d2eb715b",
         ),
         (
             Task(base_name="task", path=Path("task.py"), function=None),