Address moto>=5.0.0 compatibility (mock_s3 to mock_aws)

[d33bs]

As a CytoTable maintainer I need to ensure moto>=5.0.0 is compatible with CytoTable tests because name (and possibly other functional) changes in the moto API have occurred (mock_s3 -to-> mock_aws).

Observed within #151 (https://github.com/cytomining/CytoTable/actions/runs/7747399978/job/21127767641?pr=151). Tricky because pre-commit environments are cached and may not otherwise exhibit the issue locally for developers who may have worked with the project before.