CI: pin numpy to 1.21.5 in the Azure refguide check job (#15335)
CI: pin numpy to 1.21.5 in the Azure refguide check job (#15335)

The `linalg.lapack` warnings is the problem outlined in gh-15327.
There is one other minor printing change in `integrate`.

Given that the lapack issues must be fixed upstream in `numpy.f2py`,
we need to pin this job.

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