Update CHANGELOG.md

modify changelog to reflect release notes.

CHANGELOG.md

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 ## v0.4.3 [DBR 13.3 LTS]
 
-This is the final mainline release of Mosaic. Future development will be focused on the planned spatial-utils library, which will be a successor to Mosaic and will include new features and improvements. The first release of spatial-utils is expected in the coming months.
-
-We will continue to maintain Mosaic for the foreseeable future, including bug fixes and security updates. However, we recommend that users start transitioning to spatial-utils as soon as possible to take advantage of the new features and improvements that will be available in that library.
-
 This release includes a number of enhancements and fixes, detailed below.
 
 ### Raster checkpointing functions
@@ -14,8 +10,6 @@ Fuse-based checkpointing for raster operations is disabled by default but can be
 
 This feature is designed to improve performance and reduce memory usage for raster operations by writing intermediate data to a fuse directory. This is particularly useful for large rasters or when working with many rasters in a single operation. 
 
-We plan further enhancements to this feature (including automatic cleanup of checkpoint locations) as part of the first release of spatial-utils.
-
 ### Enhancements and fixes to the raster processing APIs
   - Added `RST_Write`, a function that permits writing each raster 'tile' in a DataFrame to a specified location (e.g. fuse directory) using the appropriate GDAL driver and tile data / path. This is useful for formalizing the path when writing a Lakehouse table and allows removal of interim checkpointed data.
   - Python bindings added for `RST_Avg`, `RST_Max`, `RST_Median`, `RST_Min`, and `RST_PixelCount`.