Merge branch 'feature/remove-dune_python_install_package' into 'master'

Robert Krequested to merge
cherry-pick-401f9582 into releases/2.9

[cmake][python] Replace deprecated dune_python_install_package

See merge request !488 (merged)

(cherry picked from commit 401f9582)

d8af376c [cmake][python] Replace deprecated dune_python_install_package

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