Merge branch 'feature/optionally-install-concrete-python-requirements' into 'master'

Andreas Dednerrequested to merge
cherry-pick-0a430ebe into releases/2.9

Add option to install concrete python requirements

See merge request !1161 (merged)

(cherry picked from commit 0a430ebe)

2d84eba7 Add option to optionally install concrete python requirements

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