Bump Python version to 3.10 in workflow files

[johnsonphil]

Workflow files "run-checks" and "run-tests" use Python 3.8 and "ci-tests" uses Python 3.9. Python 3.8 LTS end 10/2024.

Recommend bumping to Python 3.10 that has LTS through 10/2026

[arpitjasa-db]

@johnsonphil would you mind creating a PR and confirming that these workflow files still work as expected?

[mniels17]

Looks like it's only in the run-tests workflow. We've already updated on our end for GH actions, and it works as expected. I don't have an environment to test the ADO pipelines but I believe it also uses python 3.8 in the Azure pipelines. I left the Azure pipelines as is.

[arpitjasa-db]

@mniels17 solved this in #178, thank you!