[inflation_history] FIX: compat with Google Colab

[mmcky]

This PR fixes compatibility for inflation_history lecture with Google Collab due to an old version of pandas. This lecture requires pandas>=2.1.4 due to the use of .map

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[mmcky]

This solution isn't particularly pretty -- but working to anaconda is our key metric for compatibility. Will think of some ways we might be able to make this less intrusive.

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[mmcky]

@jstac this brings compatibility with google collab. I will continue to think about cleaner ways to achieve this when we have minimum version requirements in our lectures.

[mmcky]

@jstac I will merge this for now but I have it in my mind to figure out a cleaner solution.