docs: prepare for 2.13.4 (#5312)

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

docs/changelog.rst

@@ -20,7 +20,28 @@ New Features:
 * Support for Python 3.7 was removed. (Official end-of-life: 2023-06-27).
   `#5191 <https://github.com/pybind/pybind11/pull/5191>`_
 
-Support for CMake older than 3.15 and some older compilers will also be removed.
+* stl.h ``list|set|map_caster`` were made more user friendly: it is no longer
+  necessary to explicitly convert Python iterables to ``tuple()``, ``set()``,
+  or ``map()`` in many common situations.
+  `#4686 <https://github.com/pybind/pybind11/pull/4686>`_
+
+* Support for CMake older than 3.15 removed. CMake 3.15-3.30 supported.
+  `#5304 <https://github.com/pybind/pybind11/pull/5304>`_
+
+Version 2.13.4 (August 14, 2024)
+--------------------------------
+
+Bug fixes:
+
+* Fix paths with spaces, including on Windows.
+  (Replaces regression from `#5302 <https://github.com/pybind/pybind11/pull/5302>`_)
+  `#4874 <https://github.com/pybind/pybind11/pull/4874>`_
+
+Documentation:
+
+* Remove repetitive words.
+  `#5308 <https://github.com/pybind/pybind11/pull/5308>`_
+
 
 Version 2.13.3 (August 13, 2024)
 --------------------------------