They have what may be a patch but haven't merged it yet. An alternative option is to skip these tests, since this is at least an obvious crash (not a wrong answer) and upstream's longer term plan appears to be to move away from dateutil entirely.
It probably won't - this looks like upstream 71459, which is still open
(and is triggered by python3-dateutil 3.0, not python 3.15).
- Bug#1141694: transition: pandas 2.3 -> 3.0 Bastian Germann
- Bug#1141694: transition: pandas 2.3 -> 3.0 Rebecca N. Palmer
- Bug#1141694: transition: pandas 2.3 -> 3.0 Rebecca N. Palmer
- Bug#1141694: transition: pandas 2.3 -> 3... Rebecca N. Palmer

