docs: add CHANGELOG entry for Poetry to uv migration

Co-authored-by: dannywillems <6018454+dannywillems@users.noreply.github.com>

Author: Copilot

CHANGELOG.md

@@ -11,6 +11,9 @@ and this project adheres to
 ### Infrastructure
 
 - CI: bump actions/checkout from 4 to 6 ([6c9eecd], [#49])
+- Migrate from Poetry to uv: update `pyproject.toml` to PEP 621 format with
+  `hatchling` build backend, replace `poetry run` with `uv run` in Makefile,
+  and switch CI to `astral-sh/setup-uv` ([5f4fc51], [#56])
 
 ## [1.4.0] - 2026-02-09
 
@@ -158,6 +161,7 @@ and this project adheres to
 <!-- Commit links -->
 
 [6c9eecd]: https://github.com/LeakIX/l9format-python/commit/6c9eecd
+[5f4fc51]: https://github.com/LeakIX/l9format-python/commit/5f4fc51
 [ac4744e]: https://github.com/LeakIX/l9format-python/commit/ac4744e
 [d554f1e]: https://github.com/LeakIX/l9format-python/commit/d554f1e
 [7f49ff5]: https://github.com/LeakIX/l9format-python/commit/7f49ff5
@@ -242,4 +246,5 @@ and this project adheres to
 [#31]: https://github.com/LeakIX/l9format-python/issues/31
 [#32]: https://github.com/LeakIX/l9format-python/issues/32
 [#49]: https://github.com/LeakIX/l9format-python/pull/49
+[#56]: https://github.com/LeakIX/l9format-python/pull/56
 [#43]: https://github.com/LeakIX/l9format-python/issues/43