* gnu/packages/python-xyz.scm (python-cantools): Update to 37.0.7.
[arguments]: Use gexps.
[phases]: Strip trailing #t.
{build-doc}: Use make -C instead of with-directory-excursion.
{install-doc}: Adjust for gexp.
[native-inputs]: Use new style.
[propagated-inputs]: Add python-argparse-addons, python-crccheck,
python-matplotlib and python-parameterized.