CI: fix Gitpod image build (#16359)
CI: fix Gitpod image build (#16359)

In analogy to https://github.com/numpy/numpy/pull/21570

[skip azp]
rgommers/scipy,mdhaber/scipy,scipy/scipy,andyfaff/scipy,mdhaber/scipy,anntzer/scipy,WarrenWeckesser/scipy,ilayn/scipy,WarrenWeckesser/scipy,mdhaber/scipy,scipy/scipy,perimosocordiae/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,scipy/scipy,rgommers/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,anntzer/scipy,rgommers/scipy,scipy/scipy,Stefan-Endres/scipy,endolith/scipy,rgommers/scipy,ilayn/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,anntzer/scipy,ilayn/scipy,ilayn/scipy,andyfaff/scipy,anntzer/scipy,Stefan-Endres/scipy,andyfaff/scipy,WarrenWeckesser/scipy,mdhaber/scipy,andyfaff/scipy,andyfaff/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,scipy/scipy,ilayn/scipy,scipy/scipy,endolith/scipy,andyfaff/scipy,mdhaber/scipy,endolith/scipy,Stefan-Endres/scipy,endolith/scipy,rgommers/scipy,endolith/scipy,anntzer/scipy,anntzer/scipy,ilayn/scipy,perimosocordiae/scipy,mdhaber/scipy,endolith/scipy