Revert "avoid buggy ruff version"

This reverts commit 392c62c.

Author: matthiasdiener

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
             uses: actions/setup-python@v5
         -   name: "Main Script"
             run: |
-                pip install ruff!=0.11.1
+                pip install ruff
                 ruff check
 
     pylint: