switch to python3

Author: glesur

.github/workflows/idefix-ci-jobs.yml

@@ -225,9 +225,9 @@ jobs:
         run: scripts/ci/run-tests $IDEFIX_DIR/test/IO/dump -all $TESTME_OPTIONS
       - name: Pydefix
         run: |
-          python -m venv $IDEFIX_DIR/test/IO/pydefix/env
+          python3 -m venv $IDEFIX_DIR/test/IO/pydefix/env
           source $IDEFIX_DIR/test/IO/pydefix/env/activate
-          python -m pip install -r $IDEFIX_DIR/test/IO/pydefix/python_requirements.txt
+          python3 -m pip install -r $IDEFIX_DIR/test/IO/pydefix/python_requirements.txt
           scripts/ci/run-tests $IDEFIX_DIR/test/IO/pydefix -all $TESTME_OPTIONS
 
       - name: xdmf