TST: fix special test that was importing `np.testing.utils` (deprecated)
TST: fix special test that was importing `np.testing.utils` (deprecated)

This fixes the CI failures with numpy master.

rgommers/scipy,WarrenWeckesser/scipy,mdhaber/scipy,person142/scipy,grlee77/scipy,Eric89GXL/scipy,aeklant/scipy,e-q/scipy,rgommers/scipy,nmayorov/scipy,mdhaber/scipy,aarchiba/scipy,arokem/scipy,rgommers/scipy,perimosocordiae/scipy,ilayn/scipy,mdhaber/scipy,aarchiba/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,e-q/scipy,endolith/scipy,anntzer/scipy,ilayn/scipy,person142/scipy,andyfaff/scipy,aarchiba/scipy,perimosocordiae/scipy,scipy/scipy,endolith/scipy,mdhaber/scipy,anntzer/scipy,scipy/scipy,Eric89GXL/scipy,anntzer/scipy,gfyoung/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,aeklant/scipy,endolith/scipy,gertingold/scipy,pizzathief/scipy,pizzathief/scipy,endolith/scipy,aarchiba/scipy,andyfaff/scipy,jamestwebber/scipy,person142/scipy,jamestwebber/scipy,vigna/scipy,scipy/scipy,Stefan-Endres/scipy,gertingold/scipy,jor-/scipy,Eric89GXL/scipy,endolith/scipy,jor-/scipy,tylerjereddy/scipy,scipy/scipy,arokem/scipy,gfyoung/scipy,jamestwebber/scipy,vigna/scipy,arokem/scipy,grlee77/scipy,perimosocordiae/scipy,rgommers/scipy,WarrenWeckesser/scipy,aeklant/scipy,gertingold/scipy,gfyoung/scipy,gertingold/scipy,nmayorov/scipy,zerothi/scipy,jor-/scipy,anntzer/scipy,person142/scipy,vigna/scipy,Eric89GXL/scipy,zerothi/scipy,lhilt/scipy,Stefan-Endres/scipy,anntzer/scipy,e-q/scipy,nmayorov/scipy,nmayorov/scipy,tylerjereddy/scipy,arokem/scipy,person142/scipy,ilayn/scipy,tylerjereddy/scipy,lhilt/scipy,WarrenWeckesser/scipy,WarrenWeckesser/scipy,vigna/scipy,gertingold/scipy,aeklant/scipy,jor-/scipy,mdhaber/scipy,gfyoung/scipy,aarchiba/scipy,matthew-brett/scipy,nmayorov/scipy,zerothi/scipy,Stefan-Endres/scipy,jor-/scipy,matthew-brett/scipy,ilayn/scipy,Stefan-Endres/scipy,jamestwebber/scipy,endolith/scipy,ilayn/scipy,gfyoung/scipy,Eric89GXL/scipy,vigna/scipy,andyfaff/scipy,lhilt/scipy,andyfaff/scipy,pizzathief/scipy,rgommers/scipy,scipy/scipy,WarrenWeckesser/scipy,grlee77/scipy,e-q/scipy,zerothi/scipy,zerothi/scipy,Eric89GXL/scipy,pizzathief/scipy,arokem/scipy,aeklant/scipy,scipy/scipy,lhilt/scipy,andyfaff/scipy,matthew-brett/scipy,matthew-brett/scipy,anntzer/scipy,ilayn/scipy,pizzathief/scipy,tylerjereddy/scipy,matthew-brett/scipy,andyfaff/scipy,grlee77/scipy,tylerjereddy/scipy,lhilt/scipy,jamestwebber/scipy,e-q/scipy,zerothi/scipy,mdhaber/scipy,perimosocordiae/scipy,grlee77/scipy,Stefan-Endres/scipy