docs(CHANGES) Note python 3.9 ruff fixes

Author: tony

CHANGES

@@ -19,6 +19,16 @@ $ pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force
 
 <!-- Maintainers, insert changes / features for the next release here -->
 
+### Development
+
+- Aggressive automated lint fixes via `ruff` (#953)
+
+  via ruff v0.8.4, all automated lint fixes, including unsafe and previews were applied for Python 3.9:
+
+  ```sh
+  ruff check --select ALL . --fix --unsafe-fixes --preview --show-fixes; ruff format .
+  ```
+
 ## tmuxp 1.49.0 (2024-11-26)
 
 _Maintenance only, no bug fixes or new features_