CI fix-ci-isocalendar
Fix failing CI check

https://github.com/pandas-dev/pandas/runs/5874948094?check_suite_focus=true

probably caused by #46674
oh wow i guess that PR really did have an issue

merge when ready OK thanks, merging then as this at least fixes the `Code Checks / Docstring and typing validation` job Thanks for the quick fix! @meeseeksdev backport 1.4.x