Add Ruby 3.2 to the CI matrix.

[petergoldstein]

Problem

Current CI doesn't run against the most recent Ruby (3.2)

Solution

Added Ruby 3.2 to the CI matrix

Result

Ruby 3.2 will be included in the CI runs going forward. Everything still runs green.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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_{You can retrigger this bot by commenting recheck in this Pull Request}

[petergoldstein]

recheck