Fix internal dependencies of FunctorDatahandleTest

Marco Clemencicrequested to merge
clemenci-master-patch-37510 into master

The test functor cache FunctorDatahandleTest was missing a dependency, but it didn't show up until the latest attempt to release (see lhcb-core/lhcbstacks!116 (comment 6221380)).

This MR fixes the problem.

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