Fix CI.

Author: fghoussen

.github/workflows/jobs.yml

@@ -211,14 +211,15 @@ jobs:
           # https://github.com/actions/runner-images/issues/6459
           # https://github.com/actions/runner-images/issues/6507
           # https://github.com/actions/runner-images/issues/2322
-          python3 -m venv ./venv
-          source ./venv/bin/activate
           brew list -1 | grep python | while read formula; do brew unlink $formula; brew link --overwrite $formula; done
           brew reinstall gcc # brings gfortran on path
           brew install cmake eigen boost-python3 python3 
+          python3 -m venv ./venv
+          source ./venv/bin/activate
           pip3 install numpy
       - name: Run job
         run: |
+          source ./venv/bin/activate
           mkdir -p build
           cd build
           export FC=gfortran