unpin ruff version

Author: joar

.github/actions/lint/action.yml

@@ -43,7 +43,7 @@ runs:
 
     - name: Run Ruff
       run: |
-        python -m pip install -U "ruff<0.8.0"
+        python -m pip install -U "ruff"
         python -m ruff check .
         python -m ruff format --check
       working-directory: python_files