Merge branch 'bugfix/doublepackageinstallation' into 'master'

Robert Krequested to merge
cherry-pick-d53c04f5 into releases/2.9

avoid installation of dune package in skbuild mode

See merge request !1170 (merged)

(cherry picked from commit d53c04f5)

40a97da4 avoid installation of dune package in skbuild mode

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