TST: pytest.ini pytest6 compat (#11214)
TST: pytest.ini pytest6 compat (#11214)

* add value to pytest.ini for pytest6/junit compatibility
pizzathief/scipy,pizzathief/scipy,andyfaff/scipy,e-q/scipy,arokem/scipy,grlee77/scipy,Stefan-Endres/scipy,endolith/scipy,zerothi/scipy,grlee77/scipy,aeklant/scipy,mdhaber/scipy,person142/scipy,e-q/scipy,jamestwebber/scipy,perimosocordiae/scipy,endolith/scipy,e-q/scipy,vigna/scipy,tylerjereddy/scipy,jamestwebber/scipy,endolith/scipy,WarrenWeckesser/scipy,grlee77/scipy,aeklant/scipy,anntzer/scipy,person142/scipy,aeklant/scipy,person142/scipy,nmayorov/scipy,matthew-brett/scipy,Eric89GXL/scipy,mdhaber/scipy,Eric89GXL/scipy,nmayorov/scipy,rgommers/scipy,endolith/scipy,ilayn/scipy,Eric89GXL/scipy,zerothi/scipy,Eric89GXL/scipy,mdhaber/scipy,endolith/scipy,WarrenWeckesser/scipy,person142/scipy,pizzathief/scipy,anntzer/scipy,scipy/scipy,ilayn/scipy,e-q/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,nmayorov/scipy,andyfaff/scipy,WarrenWeckesser/scipy,Eric89GXL/scipy,ilayn/scipy,ilayn/scipy,matthew-brett/scipy,vigna/scipy,jamestwebber/scipy,nmayorov/scipy,tylerjereddy/scipy,endolith/scipy,tylerjereddy/scipy,andyfaff/scipy,WarrenWeckesser/scipy,anntzer/scipy,grlee77/scipy,arokem/scipy,matthew-brett/scipy,anntzer/scipy,scipy/scipy,person142/scipy,perimosocordiae/scipy,zerothi/scipy,Stefan-Endres/scipy,tylerjereddy/scipy,rgommers/scipy,e-q/scipy,scipy/scipy,andyfaff/scipy,andyfaff/scipy,matthew-brett/scipy,aeklant/scipy,scipy/scipy,Stefan-Endres/scipy,Eric89GXL/scipy,arokem/scipy,vigna/scipy,rgommers/scipy,WarrenWeckesser/scipy,ilayn/scipy,mdhaber/scipy,zerothi/scipy,anntzer/scipy,vigna/scipy,perimosocordiae/scipy,andyfaff/scipy,anntzer/scipy,Stefan-Endres/scipy,zerothi/scipy,jamestwebber/scipy,arokem/scipy,nmayorov/scipy,rgommers/scipy,ilayn/scipy,Stefan-Endres/scipy,rgommers/scipy,pizzathief/scipy,aeklant/scipy,tylerjereddy/scipy,arokem/scipy,perimosocordiae/scipy,zerothi/scipy,WarrenWeckesser/scipy,matthew-brett/scipy,mdhaber/scipy,perimosocordiae/scipy,grlee77/scipy,scipy/scipy,vigna/scipy,scipy/scipy,mdhaber/scipy,jamestwebber/scipy,pizzathief/scipy