Add test for 2D cellvoyager conversion & drop macos tests for Python 3.9 & Python 3.10

[jluethi]

Closes #684

[github-actions[bot]]

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
fractal_tasks_core/tasks
cellvoyager_to_ome_zarr_compute.py
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[jluethi]

It appears that Python 3.9 & macos 14 (which is slowly rolling out on CI) is making issues on Github CI due to issues described here: https://github.com/actions/setup-python/issues/696#issuecomment-1637587760

I will exclude macos Python 3.9 for us, as it's not essential to test all Python versions on all os for our package. Given what appears to be available on those new runners, I'm also dropping macos Python 3.10: https://github.com/actions/runner-images/blob/main/images/macos/macos-13-arm64-Readme.md#cached-tools (otherwise tests will probably fail once we get macos 14 runners for 3.10)

We could manually install Python e.g. via brew on mac runners, but I don't think that's worth the complexity & additional CI time for us. As long as we have 1 macos version being tested.

=> Conclusion is that we'll test broadly on Linux (3.9 - 3.11) & just run 3.11 for macos.

[jluethi]

@tcompa I'm merging this now to get the CI working again. Feel free to open new issues/PRs to improve this later :)