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Addresses https://github.com/metoppv/mo-blue-team/issues/542
Description
ReadTheDocs are making some deprecations: readthedocs/readthedocs.org#10587, in particular removing the system_packages option. We specify this option in IMPROVER, however, I don't think that this option is actually used because the documentation says that this option isn't used if a Conda environment is specified.
Testing: