[CI] account for changed pandas.concat sorting behavior (#201)
[CI] account for changed pandas.concat sorting behavior (#201)

* Fix #200
* Set namd parser column sorting to False

  Previous `pandas` behavior prior to 1.4.3 [did not sort numeric column
  names](https://github.com/pandas-dev/pandas/issues/47127), but this now
  occurs. We don't sort within other parsers, so switching this flag to be
  consistent with previous behavior. There is no clear reason sorting is
  necessary here.

Co-authored-by: David Dotson <ea79b0961d255bf69a4c633ca17b6595df150ed7@gmail.com>
alchemistry/alchemlyb