docs(CHANGES): Note f-string tweaks

Author: tony

CHANGES

@@ -19,6 +19,12 @@ $ pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force
 
 <!-- Maintainers, insert changes / features for the next release here -->
 
+### Development
+
+- Code quality: Use f-strings in more places (#931)
+
+  via [ruff 0.4.2](https://github.com/astral-sh/ruff/blob/v0.4.2/CHANGELOG.md).
+
 ## tmuxp 1.47.0 (2024-04-21)
 
 _Maintenance only, no bug fixes or new features_