Include workbench file when linting in GHA

[joecorall]

Link to Github issue or other discussion

#744

What does this PR do?

#744 neglected to lint ./workbench. This PR corrects that.

What changes were made?

Run black against ./workbench as well as all other python files

How to test / verify this PR?

Check the GHA actions.

Interested Parties

@mjordan

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Checklist

• Before opening this PR, have you opened an issue explaining what you want to to do?
• Have you included some configuration and/or CSV files useful for testing this PR?
• Have you written unit or integration tests if applicable?
• Does the code added in this PR require a version of Python that is higher than the current minimum version?
• If the changes in this PR require an additional Python library, have you included it in setup.py?
• If the changes in this PR add a new configuration option, have you provided a default for when the option is not present in the .yml file?

[mjordan]

Thanks @joecorall !