Bug#1053939: pymatgen: test failure with pandas 2.1

[Drew Parsons]

Source: pymatgen
Followup-For: Bug #1053939

[apologies for the spam. testing mail server configuration now]

Bug#1053939: pymatgen: test failure with pandas 2.1

[Drew Parsons]

Source: pymatgen
Followup-For: Bug #1053939

Looks like the latest release should be fine with pandas 2.
Currently building in experimental.