remove use of deprecated np.str

sot / kadi

Chandra commands and events

https://sot.github.io/kadi

BSD 3-Clause "New" or "Revised" License

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Closed javierggt closed 2 years ago

javierggt commented 2 years ago

This PR makes tiny changes to remove uses of a few deprecated dtypes (https://github.com/sot/skare3/issues/753).

[x] Passes unit tests on MacOS, linux, Windows (at least one required). Also verified that the warning appeared in the test before changes.
[ ] Functional testing

Fixes #