Add entry for model pivot build fix to 7.4.x changelog (rojo-rbx#867)

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Rojo Changelog
 
 ## Unreleased Changes
+* Fixed incorrect results when building model pivots ([#865])
 * Rojo now converts any line endings to LF, preventing spurious diffs when syncing Lua files on Windows ([#854])
 * Fixed Rojo plugin failing to connect when project contains certain unreadable properties ([#848])
 * Fixed various cases where patch visualizer would not display sync failures ([#845], [#844])
@@ -11,6 +12,7 @@
 [#844]: https://github.com/rojo-rbx/rojo/pull/844
 [#847]: https://github.com/rojo-rbx/rojo/pull/847
 [#854]: https://github.com/rojo-rbx/rojo/pull/854
+[#865]: https://github.com/rojo-rbx/rojo/pull/865
 
 ## [7.4.0] - January 16, 2024
 * Improved the visualization for array properties like Tags ([#829])