Bug#1118038: lmfit-py: tests fail: type int64 is not JSON serializable

[Santiago Vila]

Hi.

My main concern regarding upgrades to new upstream was the use of pristine-tar
(which I don't use myself for my own packages).

I see now that it's very straightforward (it's just passing --pristine-tar
to gbp import-orig), so I went ahead, pushed my changes and did the upload.

If something does not work (despite passing all the checks in Salsa CI),
we can fix afterwards.

Thanks.