update changes md

CesiumGS · Sep 16, 2024 · 244565c · 244565c
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 ##### Fixes :wrench:
 
 - Use first geometryBuffer if no best match found in I3SNode [#12132](https://github.com/CesiumGS/cesium/pull/12132)
+- Update type definitions to allow undefined for optional parameters [#12193](https://github.com/CesiumGS/cesium/pull/12193)
 
 ### 1.121.1 - 2024-09-04