Switch benchmarks to use the new location of Mule #6856
Description
https://github.com/MetOffice/mule
In future will hopefully be able to install from PyPI or conda-forge
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https://github.com/MetOffice/mule
In future will hopefully be able to install from PyPI or conda-forge