Add changelog entry for semihosting crate migration

Signed-off-by: Siddhant Pandit <70386749+Siddhant779@users.noreply.github.com>

Author: Siddhant779

CHANGELOG.md

@@ -888,7 +888,7 @@ Initial release
 
 ### [defmt-test-next]
 
-* No changes
+* [#1046] Replace `cortex-m-semihosting` with generic `semihosting` crate to support non-Cortex-M thumb targets
 
 ### [defmt-test-v0.4.0] (2025-04-01)
 
@@ -1004,6 +1004,7 @@ Initial release
 
 ---
 
+[#1046]: https://github.com/knurling-rs/defmt/pull/1046
 [#1041]: https://github.com/knurling-rs/defmt/pull/1041
 [#1036]: https://github.com/knurling-rs/defmt/pull/1036
 [#1028]: https://github.com/knurling-rs/defmt/pull/1028