test: update minimum pandas requirement for testing purposes

[chalmerlowe]

This is a WIP for testing purposes only. Trying to see what happens when we constrain the library to only using pandas 2.0 or above.

DO NOT MERGE.

[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

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