_from_module: Add caching from pytest upstream

- pytest-dev/pytest@e787d2e
- pytest-dev/pytest#11317
- https://github.com/python/cpython/blob/1c26f1ce6c3965b1f7395b60bf45d7fc0bc6de57/Lib/doctest.py#L948-L975
- https://github.com/python/cpython/blob/0c56c0502270ebe29461fe5cab3ee4d6111da650/Lib/doctest.py#L954-L981

src/doctest_docutils.py

@@ -1,4 +1,5 @@
 import doctest
+import functools
 import linecache
 import logging
 import os
@@ -362,6 +363,27 @@ def condition(node: Node) -> bool:
             if test is not None:
                 tests.append(test)
 
+    if sys.version_info < (3, 13):
+
+        def _from_module(
+            self, module: t.Optional[t.Union[str, types.ModuleType]], object: object
+        ) -> bool:
+            """`cached_property` objects are never considered a part
+            of the 'current module'. As such they are skipped by doctest.
+            Here we override `_from_module` to check the underlying
+            function instead. https://github.com/python/cpython/issues/107995
+            """
+            if isinstance(object, functools.cached_property):
+                object = object.func
+
+            # Type ignored because this is a private function.
+            return t.cast(
+                bool, super()._from_module(module, object)  # type:ignore[misc]
+            )  
+
+    else:  # pragma: no cover
+        pass
+
     def _get_test(
         self,
         string: str,