bbotk 0.9.0

[be-marc]

Hey,

the upcoming bbotk version 0.9.0 changes the names of some classes (see https://github.com/mlr-org/bbotk/blob/main/NEWS.md). I only found OptimInstanceMultiCrit in the counterfactuals code https://github.com/dandls/counterfactuals/blob/287a264221f0ae0784bc460346ca0ea37c2747fb/R/moc_algo.R#L52

which is OptimInstanceBatchMultiCrit now. Unfortunately, I couldn't check if it works because bbotk 0.9.0 already depends on the new paradox version 1.0.0 and counterfactuals uses the old paradox. When counterfactuals uses paradox 1.0.0 you should check of it works with bbotk 0.9.0.