Bharat Medasani

Spec compilation fails with python 3.13

8

For the error message take a look at https://github.com/hiddenSymmetries/simsopt/actions/runs/16472784292/job/46566116701

Update the python version and singularity version

1

Python 3.9 is reaching EOL. Changing the Python version from 3.9 to 3.13 for future proofing. Also changing from singularity to apptainer for singularity builds.