TST: reduce max memory usage for sparse.linalg.lgmres test
TST: reduce max memory usage for sparse.linalg.lgmres test

Follow-up to gh-9598.  Now really closes gh-9595.

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