don't install python on rocky, it should be included in the image

Author: matekelemen

.github/workflows/ci.yml

@@ -349,14 +349,10 @@ jobs:
 
     container:
       image: kratosmultiphysics/kratos-image-ci-rocky8:latest
+      options: --user 1001
 
     steps:
-    - uses: actions/checkout@v2
-
-    - name: Set up Python 3.9
-      uses: actions/setup-python@v5
-      with:
-        python-version: '3.9'
+    - uses: actions/checkout@v4
 
     - name: Build CoSimIO
       run: |