Add release notes for 5.11.5 hotfix release

Author: timothycrosley

CHANGELOG.md

@@ -10,6 +10,9 @@ Find out more about isort's release policy [here](https://pycqa.github.io/isort/
   - Fixed incompatiblity with latest poetry version
   - Added support for directory limitations within built in git hook
 
+### 5.11.5 January 30 2023 [hotfix]
+  - Fixed incompatiblity with latest poetry version
+
 ### 5.11.4 December 21 2022
 
   - Fixed #2038 (again): stop installing documentation files to top-level site-packages (#2057) @mgorny