Manually copy 2.11.2 Changelog addition from master

docs/changelog.rst

@@ -10,6 +10,19 @@ Changes will be added here periodically from the "Suggested changelog entry"
 block in pull request descriptions.
 
 
+Version 2.11.2 (September 13, 2024)
+-----------------------------------
+
+New Features:
+
+* A new ``self._pybind11_conduit_v1_()`` method is automatically added to all
+  ``py::class_``-wrapped types, to enable type-safe interoperability between
+  different independent Python/C++ bindings systems, including pybind11
+  versions with different ``PYBIND11_INTERNALS_VERSION``'s. Supported on
+  pybind11 2.11.2, 2.12.1, and 2.13.6+.
+  `#5296 <https://github.com/pybind/pybind11/pull/5296>`_
+
+
 Version 2.11.1 (July 17, 2023)
 -----------------------------