Update CHANGELOG

Author: Harry-Zhu-45

CHANGELOG.rst

@@ -11,6 +11,7 @@ Change Log
 
 * Use the provided alpha parameter in ``make_pppm_coulomb_forces``
   (`#2153 <https://github.com/glotzerlab/hoomd-blue/pull/2153>`__).
+* Add a unit test to verify that the export name of ``hoomd.hpmc.compute.FreeVolume``, and resolved the existing export name conflicts (`#2163 <https://github.com/glotzerlab/hoomd-blue/pull/2163>`__).
 
 5.4.0 (2025-09-26)
 ^^^^^^^^^^^^^^^^^^^^