Error while installing fbprophet 0.7.1

We are using fbprophet as a dependency in our open source time series library [Kats](https://github.com/facebookresearch/Kats).
Our recent [github build](https://github.com/facebookresearch/Kats/actions/runs/4823079152/jobs/8591861962) fails, with the error:
```
ModuleNotFoundError: No module named 'convertdate'
```

This build used to pass till 2 weeks ago, with the exact same version of fbprophet. Has anything changed, causing the build to fail?
(P.S. We cannot upgrade Prophet currently, because it will break a number of things on our end).

Searching around, I came across a [similar issues in 2020](https://github.com/facebook/prophet/issues/1598). Don't know if this is related.