Python: added v3.8.4, v3.8.5, v3.7.7, v3.7.8, v3.6.11 (#17775)
Python: added v3.8.4, v3.8.5, v3.7.7, v3.7.8, v3.6.11 (#17775)

Also added older version in the 3.6 and 3.5 series
LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack