Remove <optional> from config-file-provider dependency

[strangelookingnerd]

Remove the optional flag from the config-file-provider dependency.
To my understanding this dependency is directly referenced in ExecuteDslScripts as well as JenkinsDslScriptLoader and for that reason should not be optional.

Resolves jenkinsci/custom-folder-icon-plugin#280

Testing done

Ran existing tests without any errors.

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