Python 3.10 was released in October 2021, so we need to test for it. To
avoid explosion of the number of jobs, we only test the two most recent
Python releases and the oldest that we support.

The bash uploader is deprecated in favor of the GitHub Action script.
Unfortunately, this means that we have to collect the coverage results
ourselves, and this causes a change in the Codecov reported coverage.

According to several sources online, XCode does not support OMP. This
disables checking for OMP support when Apple's clang (XCode) is being
used.

In addition, the library associated with GCC is called gomp, with LLVM
is called just omp, and with the Intel compiler is called iomp5. SCons
can check for multiple libraries sequentially, stopping when it finds
the first successful case. Due to this, the order of the checks are
important. Presumably, iomp5 and omp will only be installed for their
respective compilers, whereas gomp is likely to be installed for all the
compilers. Thus, gomp must go last in the order. This fixes the CI to
run the OpenMP sample correctly.

This is another test for the OpenMP samples.

Older versions of SCons do not support dictionary value-types. Instead,
these must be explicitly cast to lists so that SCons can process all the
files.

Fixes Attribute error during build Cantera#1147