Relax the pin on iris to allow the use of older versions for performance reasons #3270
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Description
During testing for the v2.9.0 release of ESMValTool, we noticed that the latest versions of iris are considerably less performant with the Dask default scheduler. Therefore it would be good to allow using older versions of iris, even if these do not support the distributed scheduler. Note that a new installation will still default to the latest version of iris, so this is only for users who really want to use the older version.
See discussion in #3239 (comment)
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