science/cantera: Fix build with scons 4.5.2+

from SConstruct:
try:

from packaging.version import parse as parse_version

except ImportError:

from pkg_resources import parse_version

Reference: https://pkg-status.freebsd.org/pb2/data/124i386-default-foo/2023-11-02_15h08m17s/logs/errors/cantera-3.0.0.log
PR: 274524