CI: Unpin sphinx; Fix #16074
CI: Unpin sphinx; Fix #16074

andyfaff/scipy,andyfaff/scipy,ilayn/scipy,andyfaff/scipy,andyfaff/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,endolith/scipy,endolith/scipy,Stefan-Endres/scipy,anntzer/scipy,WarrenWeckesser/scipy,scipy/scipy,endolith/scipy,anntzer/scipy,scipy/scipy,mdhaber/scipy,rgommers/scipy,perimosocordiae/scipy,rgommers/scipy,scipy/scipy,ilayn/scipy,WarrenWeckesser/scipy,mdhaber/scipy,perimosocordiae/scipy,mdhaber/scipy,anntzer/scipy,endolith/scipy,ilayn/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,andyfaff/scipy,endolith/scipy,WarrenWeckesser/scipy,scipy/scipy,scipy/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,mdhaber/scipy,mdhaber/scipy,anntzer/scipy,rgommers/scipy,andyfaff/scipy,ilayn/scipy,rgommers/scipy,Stefan-Endres/scipy,anntzer/scipy,ilayn/scipy,perimosocordiae/scipy,ilayn/scipy,endolith/scipy,perimosocordiae/scipy,scipy/scipy,anntzer/scipy,mdhaber/scipy,WarrenWeckesser/scipy,rgommers/scipy,perimosocordiae/scipy