Identifying all first-order dependencies

[john-science]

What is the change?

I added two first-order dependencies to the pyproject.toml file.

Why is the change being made?

These are ALSO second-order dependencies. So ARMI builds fine with the pyproject.toml file as-is. But I consider this a failure of documentation. And Drew notes that we have less control as things stand.

Generally, I just want to declare all our first-order dependencies as such.

close #2038

(NOTE: I thought we had another first-order dep, mpl_toolkits, but it turns out that is just part of the matprops namespace.)

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Checklist

• This PR has only one purpose or idea.
• Tests have been added/updated to verify any new/changed code.

• The code style follows good practices.
• The commit message(s) follow good practices.

• The release notes have been updated if necessary. (I don't believe this warrants a release note.)
• The documentation is still up-to-date in the doc folder.
• The dependencies are still up-to-date in pyproject.toml.